Question: Sodium bicarbonate (NaHCO_{3}) will neutralize stomach acid (HCl) in a double replacement reaction as follows: NaHCO_{3} + HCl -> NaCl + CO_{2} + \Box What is the product necessary to make this reaction complete?

Choices:
A. 2HO
B. HO_{2}
C. H_{2}O_{2}
D. H_{2}O

Answer: D

Question: Sodium bicarbonate (NaHCO_{3}) will neutralize stomach acid (HCl) in a double replacement reaction as follows: NaHCO_{3} + HCl -> NaCl + CO_{2} + \Box What is the product necessary to make this reaction complete?
Answer:


Question: Soil is important to a forest because the soil ___.

Choices:
A. stores sunlight in the leaves
B. attracts insects that eat leaves
C. provides nutrients to the trees
D. warms the air around the trees

Answer: C

Question: Soil is important to a forest because the soil ___.
Answer:


Question: The fossils of dinosaurs that lived millions of years ago can be found in

Choices:
A. the water of oceans.
B. the ice on ponds.
C. the trunks of trees.
D. rocks in the ground.

Answer: D

Question: The fossils of dinosaurs that lived millions of years ago can be found in
Answer:


Question: Which moon phase occurs approximately 14 days after a full moon?

Choices:
A. waxing gibbous
B. waning crescent
C. first quarter
D. new moon

Answer: D

Question: Which moon phase occurs approximately 14 days after a full moon?
Answer:


Question: What has occurred when bubbles form in a liquid that is being heated?

Choices:
A. Oxygen is absorbed from the air.
B. Heat is radiating in the liquid.
C. The boiling point has been reached.
D. Molecular stability in the liquid is increasing.

Answer: C

Question: What has occurred when bubbles form in a liquid that is being heated?
Answer:


Question: Which of the following is an example of a compound?

Choices:
A. copper
B. iron
C. carbon
D. water

Answer: D

Question: Which of the following is an example of a compound?
Answer:


Question: Which investigation might be used to demonstrate potential energy?

Choices:
A. Roll one ball toward another, and see what happens when they collide.
B. Place a glass of water in the freezer, and see how long the water takes to become solid.
C. Compress a spring by different amounts, and see how far it can launch a ball into the air.
D. Roll a ball from the top of an inclined plane and determine the amount of time it takes to get to the bottom.

Answer: C

Compress a spring by different amounts, and see how far it can launch a ball into the air.

Question: Which investigation might be used to demonstrate potential energy?
Answer:


Question: The Sun releases light and heat energy that cause changes on Earth. How does the Sun's energy change water?

Choices:
A. The energy makes liquid water freeze.
B. The energy makes water vapor from liquid water.
C. The energy makes clouds release rain.
D. The energy makes water collect into puddles.

Answer: B

The energy makes water vapor from liquid water.

Question: The Sun releases light and heat energy that cause changes on Earth. How does the Sun's energy change water?
Answer:


Question: Work is a product of force and distance. Which of the following is an example of work?

Choices:
A. sitting at a desk
B. pushing on a wall
C. riding a bike
D. reading a book

Answer: C

Question: Work is a product of force and distance. Which of the following is an example of work?
Answer:


Question: A student measured liquid with a graduated cylinder. Which of the following units could be used to record the volume of the liquid?

Choices:
A. pounds
B. meters
C. grams
D. milliliters

Answer: D

Question: A student measured liquid with a graduated cylinder. Which of the following units could be used to record the volume of the liquid?
Answer:


Question: Which two are functions of flowers?

Choices:
A. attract pollinators and make seeds
B. make seeds and store food
C. store food and take in water
D. take in water and attract pollinators

Answer: A

Question: Which two are functions of flowers?
Answer:


Question: Which geologic process occurs when the acid in precipitation dissolves certain types of rock?

Choices:
1. faulting
2. tilting
3. weathering
4. erupting

Answer: 3

Question: Which geologic process occurs when the acid in precipitation dissolves certain types of rock?
Answer:


Question: Which object is the best conductor of electricity?

Choices:
A. glass rod
B. wooden stick
C. plastic straw
D. metal nail

Answer: D

Question: Which object is the best conductor of electricity?
Answer:


Question: An increase in which ecosystem factor could cause a population decline in a bird species?

Choices:
A. emigration
B. immigration
C. number of births
D. amount of food

Answer: A

Question: An increase in which ecosystem factor could cause a population decline in a bird species?
Answer:


Question: Which activity is a good health habit?

Choices:
A. drinking alcohol
B. exercising regularly
C. sleeping only 5 hours daily
D. smoking cigarettes

Answer: B

Question: Which activity is a good health habit?
Answer:


Question: Which atomic structure has the greatest mass?

Choices:
A. electron
B. neutron
C. nucleus
D. proton

Answer: C

Question: Which atomic structure has the greatest mass?
Answer:


Question: Beakers and graduated cylinders are designed to measure

Choices:
A. mass.
B. density.
C. volume.
D. viscosity.

Answer: C

Question: Beakers and graduated cylinders are designed to measure
Answer:


Question: What gas in the air do we need to breathe in order to live?

Choices:
A. nitrogen
B. oxygen
C. carbon dioxide
D. hydrogen
E. water vapor

Answer: B

Question: What gas in the air do we need to breathe in order to live?
Answer:


Question: A metal spoon, a wooden spoon, and a plastic spoon are placed in hot water. After 15 seconds, which spoon will feel hottest?

Choices:
A. The metal spoon
B. The wooden spoon
C. The plastic spoon
D. The three spoons will feel the same.

Answer: A

Question: A metal spoon, a wooden spoon, and a plastic spoon are placed in hot water. After 15 seconds, which spoon will feel hottest?
Answer:


Question: Humans interpret seeing, hearing, tasting, and smelling in the

Choices:
A. brain
B. spinal cord
C. receptors
D. skin

Answer: A

Question: Humans interpret seeing, hearing, tasting, and smelling in the
Answer:


Question: All of the following are renewable resources except

Choices:
A. minerals.
B. trees.
C. wind.
D. water.

Answer: A

Question: All of the following are renewable resources except
Answer:


Question: After which event will primary succession most likely occur?

Choices:
A. thunderstorm
B. crop harvest
C. volcanic eruption
D. urban development

Answer: C

Question: After which event will primary succession most likely occur?
Answer:


Question: The molecule ATP is composed of elements commonly found in organic molecules. Which of the following is one of these elements?

Choices:
A. aluminum
B. calcium
C. phosphorus
D. tin

Answer: C

Question: The molecule ATP is composed of elements commonly found in organic molecules. Which of the following is one of these elements?
Answer:


Question: Soil that drains slowly most likely has a high amount of

Choices:
A. ash.
B. sand.
C. clay.
D. peat.

Answer: C

Question: Soil that drains slowly most likely has a high amount of
Answer:


Question: Tiny droplets of water seen floating in the air can give scientists a clue about the weather. What are groups of these droplets called?

Choices:
A. hail
B. rain
C. a front
D. a cloud

Answer: D

Question: Tiny droplets of water seen floating in the air can give scientists a clue about the weather. What are groups of these droplets called?
Answer:


Question: Which event occurs only twice each year?

Choices:
A. lunar eclipse
B. full moon
C. equinox
D. low tide

Answer: C

Question: Which event occurs only twice each year?
Answer:


Question: Which characteristic of sound makes it possible for bats to fly in the dark without hitting any objects?

Choices:
A. refraction
B. reflection
C. conduction
D. amplification

Answer: B

Question: Which characteristic of sound makes it possible for bats to fly in the dark without hitting any objects?
Answer:


Question: One hot summer, a grassland experienced a drought. Which most likely happened in the ecosystem during this time?

Choices:
A. The competition for food among primary consumers increased.
B. Nutrients cycled through the system at a faster rate.
C. Less solar radiation was able to enter the system.
D. Secondary consumers became extinct.

Answer: A

The competition for food among primary consumers increased.

Question: One hot summer, a grassland experienced a drought. Which most likely happened in the ecosystem during this time?
Answer:


Question: A lumber company plants new trees where a forest once stood. This is an example of

Choices:
A. conserving resources.
B. consuming resources.
C. recycling resources.
D. replacing resources.

Answer: D

Question: A lumber company plants new trees where a forest once stood. This is an example of
Answer:


Question: When a cup of water at room temperature is put in a freezer, the water's state of matter will change from

Choices:
A. liquid to gas
B. gas to liquid
C. liquid to solid
D. solid to liquid

Answer: C

Question: When a cup of water at room temperature is put in a freezer, the water's state of matter will change from
Answer:


Question: When salt is added to ice, the ice begins to melt because the salt

Choices:
A. raises the freezing point.
B. lowers the freezing point.
C. raises the boiling point.
D. lowers the boiling point.

Answer: B

Question: When salt is added to ice, the ice begins to melt because the salt
Answer:


Question: How can washing your hands help keep you from getting sick?

Choices:
A. It washes away germs.
B. It makes your hands look nice.
C. It keeps your skin from drying out.
D. It makes your hands warmer.

Answer: A

Question: How can washing your hands help keep you from getting sick?
Answer:


Question: One function of the circulatory system is to carry cellular nutrients to the body. Which part of the circulatory system is responsible for exchanging nutrients and wastes?

Choices:
A. arteries
B. capillaries
C. heart
D. veins

Answer: B

Question: One function of the circulatory system is to carry cellular nutrients to the body. Which part of the circulatory system is responsible for exchanging nutrients and wastes?
Answer:


Question: To a person standing motionless on the Earth's surface on a day with no wind, in which direction would the rain appear to fall?

Choices:
A. vertically
B. diagonally
C. horizontally
D. circularly

Answer: A

Question: To a person standing motionless on the Earth's surface on a day with no wind, in which direction would the rain appear to fall?
Answer:


Question: Water moves directly from a lake to the air by which of the following processes?

Choices:
A. condensation
B. evaporation
C. precipitation
D. sedimentation

Answer: B

Question: Water moves directly from a lake to the air by which of the following processes?
Answer:


Question: People sitting around a campfire are able to feel the heat from the fire. How are the people able to feel the heat from the fire without touching the fire?

Choices:
A. The heat from the fire travels through the ground and heats the ground around the people.
B. The heat from the fire is conducted through air molecules to the people.
C. The heat from the fire rises in the air and then settles around the people.
D. The heat from the fire radiates from the fire to the people.

Answer: D

The heat from the fire radiates from the fire to the people.

Question: People sitting around a campfire are able to feel the heat from the fire. How are the people able to feel the heat from the fire without touching the fire?
Answer:


Question: Which unit of measurement do astronomers use when measuring the distance between two stars found in the Milky Way?

Choices:
A. meter
B. light-year
C. kilometer
D. astronomical unit

Answer: B

Question: Which unit of measurement do astronomers use when measuring the distance between two stars found in the Milky Way?
Answer:


Question: In a particular habitat, Animal X has two sources of food. One source is found in the water and the other source is found on land. If the main predator of Animal X is found only on land, what is the most likely structural adaptation that will be selected for in the population of Animal X?

Choices:
A. development of claws
B. increase in leg strength
C. increase in visual acuity
D. development of webbed feet

Answer: D

Question: In a particular habitat, Animal X has two sources of food. One source is found in the water and the other source is found on land. If the main predator of Animal X is found only on land, what is the most likely structural adaptation that will be selected for in the population of Animal X?
Answer:


Question: Which of the following processes makes it possible for plants to use energy from sunlight to produce their own food?

Choices:
A. metamorphosis
B. photosynthesis
C. pollination
D. reproduction

Answer: B

Question: Which of the following processes makes it possible for plants to use energy from sunlight to produce their own food?
Answer:


Question: As wood in a campfire burns, it releases heat and becomes ash. What kind of change occurs in the wood when it burns and releases heat?

Choices:
A. nuclear
B. magnetic
C. chemical
D. mechanical

Answer: C

Question: As wood in a campfire burns, it releases heat and becomes ash. What kind of change occurs in the wood when it burns and releases heat?
Answer:


Question: One system of the human body works along with the skeletal system by assisting movement and maintaining posture. Which system is being described?

Choices:
A. respiratory
B. circulatory
C. muscular
D. digestive

Answer: C

Question: One system of the human body works along with the skeletal system by assisting movement and maintaining posture. Which system is being described?
Answer:


Question: Food provides calories needed by the body for energy. However, the body must use energy between meals when food is not consumed. What is the most likely response of the body when more energy is used than the calories consumed provide?

Choices:
A. to increase blood flow to the limbs for energy production
B. to release energy from lipids stored throughout the body
C. to transform stored proteins into carbohydrates for energy
D. to contract muscles to create heat energy for the body

Answer: B

to release energy from lipids stored throughout the body

Question: Food provides calories needed by the body for energy. However, the body must use energy between meals when food is not consumed. What is the most likely response of the body when more energy is used than the calories consumed provide?
Answer:


Question: Katie has a mixture of iron filings and sand. She wants to separate them. How can she do this?

Choices:
A. Shake the mixture, and the iron filings will rise to the surface.
B. Add water to the mixture, and the sand will dissolve in the water.
C. Put the mixture through a sieve, and the sand will remain in the sieve.
D. Pass a magnet over the mixture, and the magnet will attract the iron fillings.

Answer: D

Pass a magnet over the mixture, and the magnet will attract the iron fillings.

Question: Katie has a mixture of iron filings and sand. She wants to separate them. How can she do this?
Answer:


Question: Biochemical reactions that require high temperatures to proceed are able to take place at body temperature within the cells of living organisms. Which factor is mainly responsible for allowing biochemical reactions to proceed at body temperature?

Choices:
A. The cellular enzymes act as catalysts.
B. The small size of cells keeps reactants together.
C. The pH of the cytoplasm increases reaction rate.
D. The reactants are present in small quantities in the cell.

Answer: A

Question: Biochemical reactions that require high temperatures to proceed are able to take place at body temperature within the cells of living organisms. Which factor is mainly responsible for allowing biochemical reactions to proceed at body temperature?
Answer:


Question: Which of these objects will rust?

Choices:
A. wood chips
B. plastic straws
C. iron nails
D. glass beads

Answer: C

Question: Which of these objects will rust?
Answer:


Question: The motion of a car accelerating in a straight line differs from the motion of a car moving in a straight line at a constant speed. Which change best describes acceleration of a car?

Choices:
A. a change in the direction of the car
B. a change in the distance the car travels
C. the change in velocity divided by the time for that change
D. the change in the time for the car to travel a distance

Answer: C

the change in velocity divided by the time for that change

Question: The motion of a car accelerating in a straight line differs from the motion of a car moving in a straight line at a constant speed. Which change best describes acceleration of a car?
Answer:


Question: Coal is used for generating about 53% of the electrical energy in the United States. Which of these environmental issues is directly contributed to by the burning of coal?

Choices:
A. beach erosion
B. ozone depletion
C. overfishing
D. air pollution

Answer: D

Question: Coal is used for generating about 53% of the electrical energy in the United States. Which of these environmental issues is directly contributed to by the burning of coal?
Answer:


Question: Sound reaches our ears because sound makes air particles

Choices:
A. heat up.
B. cool down.
C. slow down.
D. vibrate.

Answer: D

Question: Sound reaches our ears because sound makes air particles
Answer:


Question: Many organisms have structures for protection and survival. Which structure is most similar to tree bark?

Choices:
A. bird beak
B. bear claws
C. human skin
D. snake fangs

Answer: C

Question: Many organisms have structures for protection and survival. Which structure is most similar to tree bark?
Answer:


Question: A class conducts an experiment to determine the best color to paint a solar water heater that they plan to build. For their experimental test, the students have four identical cans. They paint one black, one green, one red, and one white. Each can is filled with 500 mL of 22°C water, and is allowed to sit in the sun for two hours. Which color can will have the greatest increase in water temperature?

Choices:
A. black
B. green
C. red
D. white

Answer: A

Question: A class conducts an experiment to determine the best color to paint a solar water heater that they plan to build. For their experimental test, the students have four identical cans. They paint one black, one green, one red, and one white. Each can is filled with 500 mL of 22°C water, and is allowed to sit in the sun for two hours. Which color can will have the greatest increase in water temperature?
Answer:


Question: The National Aeronautics and Space Administration (NASA) is the agency responsible for the space program in the United States. What was the goal of NASA's Apollo program?

Choices:
A. to search for life on planets other than Earth
B. to land on a planet in another solar system
C. to determine the composition the Sun
D. to send a human to land on the Moon

Answer: D

Question: The National Aeronautics and Space Administration (NASA) is the agency responsible for the space program in the United States. What was the goal of NASA's Apollo program?
Answer:


Question: The sum of protons and neutrons in the nucleus of an atom is called the

Choices:
A. valence.
B. mass number.
C. chemical property.
D. electrical charge.

Answer: B

Question: The sum of protons and neutrons in the nucleus of an atom is called the
Answer:


Question: Oxygen-rich blood returns from the lungs to the heart. Which two systems are most directly involved in this process?

Choices:
A. excretory and digestive
B. circulatory and excretory
C. digestive and respiratory
D. respiratory and circulatory

Answer: D

Question: Oxygen-rich blood returns from the lungs to the heart. Which two systems are most directly involved in this process?
Answer:


Question: As some organisms die, their remains become buried by mud and are eventually compressed into a type of rock. Which of these is a rock type that forms from this process?

Choices:
A. igneous
B. sedimentary
C. magma
D. metamorphic

Answer: B

Question: As some organisms die, their remains become buried by mud and are eventually compressed into a type of rock. Which of these is a rock type that forms from this process?
Answer:


Question: Animals depend on plants for many things, including food. What do plants depend on from animals?

Choices:
A. energy for photosynthesis
B. pest control
C. carbon dioxide
D. oxygen

Answer: C

Question: Animals depend on plants for many things, including food. What do plants depend on from animals?
Answer:


Question: In an ecosystem, not all of the energy that is available is used by the organisms. Some energy becomes unavailable before it can be transferred to organisms in the next trophic level. How does the energy most likely become unavailable?

Choices:
A. The energy is stored as food.
B. The energy is dissipated as heat.
C. The energy is trapped in dead organisms.
D. The energy is moved to another ecosystem.

Answer: B

Question: In an ecosystem, not all of the energy that is available is used by the organisms. Some energy becomes unavailable before it can be transferred to organisms in the next trophic level. How does the energy most likely become unavailable?
Answer:


Question: What are produced in both the male and female reproductive systems in humans?

Choices:
1. sperm
2. nutrients
3. fertilized eggs
4. sex cells

Answer: 4

Question: What are produced in both the male and female reproductive systems in humans?
Answer:


Question: Students are comparing different rocks. What do all rocks have in common?

Choices:
A. Rocks are made of one or more minerals.
B. Rocks are made of two or more elements.
C. Rocks are made of magma and sediments.
D. Rocks are made of sand changed by pressure.

Answer: A

Question: Students are comparing different rocks. What do all rocks have in common?
Answer:


Question: As a corn plant ages, its leaves grow. Which process is directly responsible for the growth of these leaves?

Choices:
A. the division of cells in the plant
B. the release of oxygen from the plant
C. the absorption of carbon dioxide in the stem
D. the transportation of nutrients from the roots

Answer: A

Question: As a corn plant ages, its leaves grow. Which process is directly responsible for the growth of these leaves?
Answer:


Question: Tree roots can grow into rock and break it apart. Water can freeze in the cracks of rock, causing it to break apart. How are these two processes alike?

Choices:
A. Both are forces.
B. Both affect weather.
C. Both form new kinds of rock.
D. Both are forms of weathering.

Answer: D

Question: Tree roots can grow into rock and break it apart. Water can freeze in the cracks of rock, causing it to break apart. How are these two processes alike?
Answer:


Question: In which situation would osmosis most likely occur in cells?

Choices:
A. across a permeable membrane that separates solutions of the same concentration
B. across a permeable membrane that separates solutions of different concentrations
C. across a nonpermeable membrane that separates solutions of the same concentration
D. across a nonpermeable membrane that separates solutions of different concentrations

Answer: B

across a permeable membrane that separates solutions of different concentrations

Question: In which situation would osmosis most likely occur in cells?
Answer:


Question: A student wants to know which type of soil holds the most water. Which action should the student most likely do to answer the question?

Choices:
A. compare how the soils are alike
B. put the soils into different groups
C. record the weight of the soil
D. watch how quickly the soil drains

Answer: D

Question: A student wants to know which type of soil holds the most water. Which action should the student most likely do to answer the question?
Answer:


Question: Which of these colors of visible light has the shortest wavelength?

Choices:
A. red
B. green
C. violet
D. yellow

Answer: C

Question: Which of these colors of visible light has the shortest wavelength?
Answer:


Question: Which of these atomic structures has the least amount of mass?

Choices:
A. an ion
B. a proton
C. a neutron
D. an electron

Answer: D

Question: Which of these atomic structures has the least amount of mass?
Answer:


Question: Some students measure the mass of a small pile of leaves before and after the leaves decompose. Each time the students measure the mass, they place a container with the decomposing leaves on a balance. Before recording the mass of the leaves, the students must do which of the following?

Choices:
A. Subtract the mass of the container
B. Add leaves from other plants to the container
C. Allow the leaves to settle in the container for a few days
D. Use a metric ruler to measure the volume of the container

Answer: A

Question: Some students measure the mass of a small pile of leaves before and after the leaves decompose. Each time the students measure the mass, they place a container with the decomposing leaves on a balance. Before recording the mass of the leaves, the students must do which of the following?
Answer:


Question: Plants growing in a pond release a gas that fish need to survive. Which gas do the plants release that fish use?

Choices:
A. helium
B. hydrogen
C. nitrogen
D. oxygen

Answer: D

Question: Plants growing in a pond release a gas that fish need to survive. Which gas do the plants release that fish use?
Answer:


Question: If a student playing the drums hits the drums with greater force, the sound would be

Choices:
A. quieter.
B. louder.
C. lower in pitch.
D. higher in pitch.

Answer: B

Question: If a student playing the drums hits the drums with greater force, the sound would be
Answer:


Question: Eyeglasses help a nearsighted person see as a result of

Choices:
A. absorption.
B. diffraction.
C. reflection.
D. refraction.

Answer: D

Question: Eyeglasses help a nearsighted person see as a result of
Answer:


Question: A student is measuring the speed at which a ball rolls down a ramp. Which unit of measurement is the student most likely using to describe the speed of the ball?

Choices:
A. meter per liter
B. seconds per gram
C. milligrams per liter
D. centimeters per second

Answer: D

Question: A student is measuring the speed at which a ball rolls down a ramp. Which unit of measurement is the student most likely using to describe the speed of the ball?
Answer:


Question: During a biochemical reaction, pyruvate (C3H4O3) is converted into carbon dioxide (CO2) and water (H2O). In what cellular organelle does this biochemical reaction occur?

Choices:
A. nucleus
B. cytoplasm
C. mitochondria
D. endoplasmic reticulum

Answer: C

Question: During a biochemical reaction, pyruvate (C3H4O3) is converted into carbon dioxide (CO2) and water (H2O). In what cellular organelle does this biochemical reaction occur?
Answer:


Question: When entire communities in an ecosystem change over time, it is known as

Choices:
A. migration.
B. extinction.
C. overpopulation.
D. ecological succession.

Answer: D

Question: When entire communities in an ecosystem change over time, it is known as
Answer:


Question: Pesticides are chemicals that kill insects. What could happen if the pesticides killed all the pollinators near some apple trees?

Choices:
A. The trees could not make leaves.
B. The trees could not make flowers.
C. The trees could not make seeds.
D. The trees could not make bark.

Answer: C

Question: Pesticides are chemicals that kill insects. What could happen if the pesticides killed all the pollinators near some apple trees?
Answer:


Question: A scientific explanation should include a demonstration of the relationships between

Choices:
A. measurement, form, and function.
B. changes, interactions, and formulas.
C. logic, evidence, and current knowledge.
D. hypothesis, problem solving, and lab equipment.

Answer: C

Question: A scientific explanation should include a demonstration of the relationships between
Answer:


Question: Which quantity must equal zero if a car is moving at a constant rate along a straight line?

Choices:
A. speed of the car
B. direction of the car
C. energy of the car
D. acceleration of the car

Answer: D

Question: Which quantity must equal zero if a car is moving at a constant rate along a straight line?
Answer:


Question: Soil will pack down over time which decreases the ability of the soil to hold water. Which animals would best help the soil hold water?

Choices:
A. earthworms making tunnels under the surface
B. cattle making depressions with their hooves
C. horses making trenches when they gallop
D. sheep pulling up plants by their roots

Answer: A

earthworms making tunnels under the surface

Question: Soil will pack down over time which decreases the ability of the soil to hold water. Which animals would best help the soil hold water?
Answer:


Question: Which question can be answered by scientific experimentation and observation?

Choices:
A. Are dogs better pets than cats?
B. How many stars are in the universe?
C. In what type of light will a plant grow best?
D. How many organisms have lived on Earth?

Answer: C

In what type of light will a plant grow best?

Question: Which question can be answered by scientific experimentation and observation?
Answer:


Question: A large mammal lives in a cold, snowy environment. Which adaptation would best help the mammal survive in low temperatures?

Choices:
A. thick fur
B. sharp claws
C. large ears
D. strong muscles

Answer: A

Question: A large mammal lives in a cold, snowy environment. Which adaptation would best help the mammal survive in low temperatures?
Answer:


Question: The phases of the Moon are daily changes in the appearance of the Moon. One reason Moon phases occur is because the Moon reflects sunlight. Which is another reason that the phases of the Moon occur?

Choices:
A. Earth is tilted on the axis.
B. The Moon rises and sets.
C. The Moon orbits Earth.
D. Earth orbits the Sun.

Answer: C

Question: The phases of the Moon are daily changes in the appearance of the Moon. One reason Moon phases occur is because the Moon reflects sunlight. Which is another reason that the phases of the Moon occur?
Answer:


Question: Which action should be taken in order to identify the streak of a mineral during an investigation?

Choices:
A. Weigh the mineral
B. Dip the mineral in acid
C. Heat the mineral until it melts
D. Drag an edge of the mineral across a tile

Answer: D

Drag an edge of the mineral across a tile

Question: Which action should be taken in order to identify the streak of a mineral during an investigation?
Answer:


Question: Which is NOT an example of a chemical change?

Choices:
A. Melting ice
B. corroding silver
C. Burning match
D. Rotting vegetation

Answer: A

Question: Which is NOT an example of a chemical change?
Answer:


Question: Which of the following is most likely to disrupt the natural balance in an ecosystem?

Choices:
A. introduction of a non-native species
B. reduced daylight hours during winter
C. preventing the cutting of trees in forests
D. riverbank erosion resulting from springtime flooding

Answer: A

Question: Which of the following is most likely to disrupt the natural balance in an ecosystem?
Answer:


Question: Many scientists think that when birds migrate to the same location each year, they find this location by using Earth's

Choices:
A. jet stream.
B. weather patterns.
C. magnetic patterns.
D. electrical discharges.

Answer: C

Question: Many scientists think that when birds migrate to the same location each year, they find this location by using Earth's
Answer:


Question: On the Galapagos Islands, an iguana that lives in the water is most likely able to survive without competition from an iguana that lives on land because it

Choices:
A. swims faster.
B. has a larger body.
C. has a tougher scaly skin.
D. has a different food source.

Answer: D

Question: On the Galapagos Islands, an iguana that lives in the water is most likely able to survive without competition from an iguana that lives on land because it
Answer:


Question: Which of the following is best classified as a nonrenewable resource?

Choices:
A. Grass
B. Aluminum
C. Sunlight
D. Oxygen

Answer: B

Question: Which of the following is best classified as a nonrenewable resource?
Answer:


Question: James placed a breath mint and a lump of toothpaste in a cup of water and let it sit overnight. Which statement best explains why the breath mint was gone the following morning, but the toothpaste was still at the bottom of the cup?

Choices:
A. The breath mint was less soluble than the toothpaste.
B. The breath mint was more soluble than the toothpaste.
C. The breath mint had a lower density than the toothpaste.
D. The breath mint had a greater density than the toothpaste.

Answer: B

The breath mint was more soluble than the toothpaste.

Question: James placed a breath mint and a lump of toothpaste in a cup of water and let it sit overnight. Which statement best explains why the breath mint was gone the following morning, but the toothpaste was still at the bottom of the cup?
Answer:


Question: Which tool, when properly used, would best help a student classify a basket of apples into groups based on mass?

Choices:
A. balance
B. thermometer
C. meter stick
D. graduated cylinder

Answer: A

Question: Which tool, when properly used, would best help a student classify a basket of apples into groups based on mass?
Answer:


Question: Students visit an aquarium and watch how an octopus behaves in its tank. Which behavior did the octopus most likely learn from its aquarium environment?

Choices:
A. waiting to be fed at the aquarium door
B. catching food using its arms
C. being more active at night
D. hiding behind rocks

Answer: A

Question: Students visit an aquarium and watch how an octopus behaves in its tank. Which behavior did the octopus most likely learn from its aquarium environment?
Answer:


Question: Which set of tools would be best to use for dissecting in a biology lab?

Choices:
A. pen, paper, and a computer
B. scissors, forceps, and a scalpel
C. petri dish, flask, and a Bunsen burner
D. glass slides, dye, and a light microscope

Answer: B

Question: Which set of tools would be best to use for dissecting in a biology lab?
Answer:


Question: The ichthyornis was a type of bird that lived over 65 million years ago. It lived near the sea and hunted for fish over the water. Fossils have been found in Kansas, many miles from the present-day ocean. Which cause of extinction is most likely to be found in the fossil record along with ichthyornis fossils?

Choices:
A. changes in the environment
B. diseases causing illness
C. changes in the weather
D. predator animals

Answer: A

Question: The ichthyornis was a type of bird that lived over 65 million years ago. It lived near the sea and hunted for fish over the water. Fossils have been found in Kansas, many miles from the present-day ocean. Which cause of extinction is most likely to be found in the fossil record along with ichthyornis fossils?
Answer:


Question: What is the primary energy source driving circulation of ocean currents on Earth?

Choices:
A. geothermal heating
B. planetary rotation
C. solar heating
D. lunar tidal forces

Answer: C

Question: What is the primary energy source driving circulation of ocean currents on Earth?
Answer:


Question: When an electric fan is running, most of the incoming electrical energy changes into which kind of energy?

Choices:
A. heat energy
B. light energy
C. mechanical energy
D. sound energy

Answer: C

Question: When an electric fan is running, most of the incoming electrical energy changes into which kind of energy?
Answer:


Question: Which factor will cause a decrease in the force of attraction between two magnets?

Choices:
A. increasing the size of the two magnets
B. increasing the distance between the two magnets
C. changing the color of the two magnets
D. changing the texture of the two magnets

Answer: B

increasing the distance between the two magnets

Question: Which factor will cause a decrease in the force of attraction between two magnets?
Answer:


Question: Jamil studied how the position of Earth around the Sun affects the energy available on Earth. Which best explains why a particular place on Earth receives more energy during summer months than winter months?

Choices:
A. the tilt of Earth
B. the rotation of Earth
C. the distance between Earth and the Sun
D. the amount of rays produced by the Sun

Answer: A

Question: Jamil studied how the position of Earth around the Sun affects the energy available on Earth. Which best explains why a particular place on Earth receives more energy during summer months than winter months?
Answer:


Question: It took Stephen 12 seconds to run across a grass field. Which additional information does he need in order to calculate his acceleration during the run?

Choices:
A. the direction he ran and the average speed
B. the distance he ran and the average velocity
C. the beginning speed and the direction he ran
D. the beginning velocity and the ending velocity

Answer: D

the beginning velocity and the ending velocity

Question: It took Stephen 12 seconds to run across a grass field. Which additional information does he need in order to calculate his acceleration during the run?
Answer:


Question: A class wanted to see which paper airplane design could fly the farthest. In order to have the most accurate results, every student should

Choices:
A. use the same size of paper.
B. buy the same color of paper.
C. fold the paper the same way.
D. decorate the paper the same way.

Answer: A

Question: A class wanted to see which paper airplane design could fly the farthest. In order to have the most accurate results, every student should
Answer:


Question: If the body takes in more food than it uses.

Choices:
A. breathing becomes faster.
B. weight is lost.
C. the heart rate increases.
D. the food is stored as fat.

Answer: D

Question: If the body takes in more food than it uses.
Answer:


Question: There are different kinds of muscles in the human body. Each muscle is formed from a group of cells that works together. The main function of a group of muscle cells is to

Choices:
A. make oxygen.
B. release energy.
C. digest nutrients.
D. cause movement.

Answer: D

Question: There are different kinds of muscles in the human body. Each muscle is formed from a group of cells that works together. The main function of a group of muscle cells is to
Answer:


Question: In which part of a plant cell does photosynthesis occur?

Choices:
1. nucleus
2. chloroplast
3. cell membrane
4. cell wall

Answer: 2

Question: In which part of a plant cell does photosynthesis occur?
Answer:


Question: Which is a force that keeps Earth in orbit around the Sun?

Choices:
A. friction
B. gravity
C. radiation
D. magnetism

Answer: B

Question: Which is a force that keeps Earth in orbit around the Sun?
Answer:


Question: Earth's hydrosphere is best described as the

Choices:
1. relatively thin layer of rock found above Earth's mantle
2. relatively thin layer of water covering most of Earth's crust
3. hot liquid rock located in Earth's outer core
4. very dense rock located in Earth's inner core

Answer: 2

relatively thin layer of water covering most of Earth's crust

Question: Earth's hydrosphere is best described as the
Answer:


Question: What condition is most likely to spread an illness between people?

Choices:
A. a virus suspended in the air
B. an accident on a playground
C. a genetic mutation in somatic cells
D. an occurrence of acid rain

Answer: A

Question: What condition is most likely to spread an illness between people?
Answer:


Question: While conducting an experiment on gravity, what will be needed to ensure the safety of students?

Choices:
A. quiet zones
B. drop zones
C. heavy objects
D. frictionless surfaces

Answer: B

Question: While conducting an experiment on gravity, what will be needed to ensure the safety of students?
Answer:


Question: When a star explodes, an intensely bright object is formed. What is the name of this object?

Choices:
A. nova
B. red giant
C. supernova
D. white dwarf

Answer: C

Question: When a star explodes, an intensely bright object is formed. What is the name of this object?
Answer:


Question: Which current property of our solar system is mainly due to solar emissions occurring soon after the initiation of fusion in the Sun's core?

Choices:
A. directions of revolution of the planets
B. directions of rotation of the planets
C. distribution of moons among the planets
D. distribution of elements among the planets

Answer: D

distribution of elements among the planets

Question: Which current property of our solar system is mainly due to solar emissions occurring soon after the initiation of fusion in the Sun's core?
Answer:


Question: Which is a characteristic of sedimentary rock?

Choices:
A. forms in layers
B. looks very shiny
C. contains crystals
D. forms from magma

Answer: A

Question: Which is a characteristic of sedimentary rock?
Answer:


Question: Rock that is made of material that has settled to the bottom of lakes and oceans and been compressed and hardened is

Choices:
A. conglomerate rock
B. volcanic rock
C. sedimentary rock
D. metamorphic rock

Answer: C

Question: Rock that is made of material that has settled to the bottom of lakes and oceans and been compressed and hardened is
Answer:


Question: Which of these statements is true about the parts that make up the atom?

Choices:
A. Protons are larger than neutrons.
B. Electrons have a positive charge.
C. Electrons are inside the nucleus.
D. Neutrons have no charge.

Answer: D

Question: Which of these statements is true about the parts that make up the atom?
Answer:


Question: The oil used today is made from the ancient remains of tiny sea creatures called "Diatoms." When they were alive, the Diatoms converted sunlight into stored energy. Based on this information, which of the following statements is true?

Choices:
A. The Sun turned diatoms into oil after 10-20 years.
B. Diatoms are the original source of energy for oil.
C. The Sun is the original source of energy for oil.
D. Diatoms converted oil into energy.

Answer: C

The Sun is the original source of energy for oil.

Question: The oil used today is made from the ancient remains of tiny sea creatures called "Diatoms." When they were alive, the Diatoms converted sunlight into stored energy. Based on this information, which of the following statements is true?
Answer:


Question: What is responsible for changing the remains of prehistoric sea animals into natural gas?

Choices:
A. time
B. water
C. gravity
D. pressure

Answer: D

Question: What is responsible for changing the remains of prehistoric sea animals into natural gas?
Answer:


Question: Nitrogen, a nutrient found in fertilizer, helps plants increase in size. Rainwater runoff often carries fertilizer into ponds and lakes. What effect does excess nitrogen have on organisms in a pond or lake ecosystem?

Choices:
A. Algae grows rapidly.
B. Mutations occur gradually in fish.
C. Clam shells are slowly weakened.
D. Frogs adapt quickly to new food sources.

Answer: A

Question: Nitrogen, a nutrient found in fertilizer, helps plants increase in size. Rainwater runoff often carries fertilizer into ponds and lakes. What effect does excess nitrogen have on organisms in a pond or lake ecosystem?
Answer:


Question: Which particles make up the mass of an atom?

Choices:
A. protons and neutrons
B. protons and electrons
C. neutrons and molecules
D. electrons and molecules

Answer: A

Question: Which particles make up the mass of an atom?
Answer:


Question: Which statement about plant and animal cells is true?

Choices:
A. Both have a cell wall to give them support.
B. Both have a large vacuole to store water.
C. Both use mitochondria to produce energy.
D. Both use chloroplasts to store energy.

Answer: C

Both use mitochondria to produce energy.

Question: Which statement about plant and animal cells is true?
Answer:


Question: What is the first thing a student should do before starting an experiment?

Choices:
A. read all the directions
B. find a lab partner
C. make notes about observations
D. write a report on the investigation

Answer: A

Question: What is the first thing a student should do before starting an experiment?
Answer:


Question: Which had the greatest impact on the way humans heat their homes?

Choices:
A. Newton's theory of gravity
B. Mendel's experiments with pea plants
C. Franklin's experiments with electricity
D. Darwin's research on the Galapagos islands

Answer: C

Question: Which had the greatest impact on the way humans heat their homes?
Answer:


Question: A student performs an investigation using anti-bacterial hand soap. The student washes only his left hand with anti-bacterial soap, but cultures swabs from both hands. The cultures from both hands were incubated at room temperature for 48 hours before being examined. Which best explains the purpose of using soap on only the left hand?

Choices:
A. to act as a controlled variable for the investigation
B. to act as the dependent variable for the investigation
C. to provide another testable variable for the investigation
D. to serve as the independent variable for the investigation

Answer: D

to serve as the independent variable for the investigation

Question: A student performs an investigation using anti-bacterial hand soap. The student washes only his left hand with anti-bacterial soap, but cultures swabs from both hands. The cultures from both hands were incubated at room temperature for 48 hours before being examined. Which best explains the purpose of using soap on only the left hand?
Answer:


Question: In the rock cycle, sedimentary rock forms when rock is

Choices:
A. crystallized into natural glass.
B. exposed to great temperature.
C. melted into liquid magma.
D. broken down by weathering.

Answer: D

Question: In the rock cycle, sedimentary rock forms when rock is
Answer:


Question: Which statement describes the reason why an ice cube melts when set out in a warm room?

Choices:
A. Heat from the room is absorbed by the ice cube.
B. The ice cube molecules move more slowly.
C. One side of the ice cube is colder than the other.
D. Heat from the ice cube moves into the air.

Answer: A

Heat from the room is absorbed by the ice cube.

Question: Which statement describes the reason why an ice cube melts when set out in a warm room?
Answer:


Question: Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?

Choices:
A. an atom
B. a compound
C. an element
D. a mixture

Answer: B

Question: Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?
Answer:


Question: When humans move into an area, they sometimes plant grasses, flowers, or trees that are not native to the area. The non-native species sometimes choke out the native species. Which organism would most likely be harmed by a loss of native plants in the area?

Choices:
A. the fungi that break down dead plants
B. the beetles that eat a variety of grass roots
C. the mosquitoes that hide under plant leaves
D. the caterpillars that eat only one type of plant

Answer: D

the caterpillars that eat only one type of plant

Question: When humans move into an area, they sometimes plant grasses, flowers, or trees that are not native to the area. The non-native species sometimes choke out the native species. Which organism would most likely be harmed by a loss of native plants in the area?
Answer:


Question: A tulip growing in a pot is placed at the center of a table. Which of these nearby objects will the tulip grow toward?

Choices:
A. a sunny window
B. an electric heater
C. a large bowl of water
D. a fan blowing gently

Answer: A

Question: A tulip growing in a pot is placed at the center of a table. Which of these nearby objects will the tulip grow toward?
Answer:


Question: A large piece of ice is placed on the sidewalk on a warm day. What will happen to the ice?

Choices:
A. It will melt to form liquid water.
B. It will melt to form water vapor.
C. It will freeze to form liquid water.
D. It will not change at all.

Answer: A

Question: A large piece of ice is placed on the sidewalk on a warm day. What will happen to the ice?
Answer:


Question: What is the major source of energy for food chains?

Choices:
A. water
B. air
C. sunlight
D. grass

Answer: C

Question: What is the major source of energy for food chains?
Answer:


Question: At which location are oceans the deepest?

Choices:
A. Mid-ocean ridge
B. Abyssal plain
C. Ocean trench
D. Volcanic island

Answer: C

Question: At which location are oceans the deepest?
Answer:


Question: Which tool will best help scientists understand relationships between oceans and climate changes?

Choices:
A. a computer model
B. a weather balloon
C. a rain gauge
D. radar

Answer: A

Question: Which tool will best help scientists understand relationships between oceans and climate changes?
Answer:


Question: Human activity most likely contributes to which of the following changes on Earth?

Choices:
A. an increase in the length of a day
B. a decrease in the number of volcanic eruptions
C. a decrease in the magnitude of large earthquakes
D. an increase in the amount of atmospheric carbon dioxide

Answer: D

an increase in the amount of atmospheric carbon dioxide

Question: Human activity most likely contributes to which of the following changes on Earth?
Answer:


Question: Which of the following is most necessary for life to develop on another planet?

Choices:
A. liquid water
B. rocky surfaces
C. warm soil
D. atmospheric oxygen

Answer: A

Question: Which of the following is most necessary for life to develop on another planet?
Answer:


Question: Which function requires the muscular, skeletal, and nervous systems to work together?

Choices:
A. movement of appendages
B. completion of blood circulation
C. absorption of nutrients
D. regulation of hormones

Answer: A

Question: Which function requires the muscular, skeletal, and nervous systems to work together?
Answer:


Question: A sunspot appears as a dark spot on the sun that is cooler than the surrounding area. On which region of the sun do sunspots occur?

Choices:
A. chromosphere
B. core
C. corona
D. photosphere

Answer: D

Question: A sunspot appears as a dark spot on the sun that is cooler than the surrounding area. On which region of the sun do sunspots occur?
Answer:


Question: Mutations that occur in sex cells can be passed from parent to offspring during

Choices:
A. cloning.
B. budding.
C. binary fission.
D. sexual reproduction.

Answer: D

Question: Mutations that occur in sex cells can be passed from parent to offspring during
Answer:


Question: A dietary supplement manufacturer developed a new calcium supplement that appears to increase the bone density in middle-aged women. When tested in a small clinical trial, the supplement was shown to cause a 15% increase in bone density in 8 out of 10 women. Before the supplement is offered to the general public, which step should the manufacturer take next?

Choices:
A. add a variety of vitamins to the supplement
B. test the supplement on mice in the laboratory
C. develop packaging that is attractive to women
D. test the supplement on a larger sample of women

Answer: D

test the supplement on a larger sample of women

Question: A dietary supplement manufacturer developed a new calcium supplement that appears to increase the bone density in middle-aged women. When tested in a small clinical trial, the supplement was shown to cause a 15% increase in bone density in 8 out of 10 women. Before the supplement is offered to the general public, which step should the manufacturer take next?
Answer:


Question: Mrs. Henderson's class has five small covered boxes. One contains perfume; another contains dried onions. There is also a box of pine needles, a box of lemon pieces, and a box with a paper towel wetted with vanilla flavoring. Which should they do to get the best information about what is in each box?

Choices:
A. Shake the boxes.
B. Smell the boxes.
C. Listen to the boxes.
D. Weigh the boxes.

Answer: B

Question: Mrs. Henderson's class has five small covered boxes. One contains perfume; another contains dried onions. There is also a box of pine needles, a box of lemon pieces, and a box with a paper towel wetted with vanilla flavoring. Which should they do to get the best information about what is in each box?
Answer:


Question: What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

Choices:
A. very high melting point
B. gas state at room temperature
C. good conductor of electric current
D. extremely brittle solid at room temperature

Answer: B

Question: What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?
Answer:


Question: What is the most likely effect of a drought on a population of frogs that live in a shallow swamp?

Choices:
A. only younger frogs will survive
B. the number of predators will increase
C. decrease in frog population as water evaporates
D. increase in frog population as more land is exposed

Answer: C

decrease in frog population as water evaporates

Question: What is the most likely effect of a drought on a population of frogs that live in a shallow swamp?
Answer:


Question: Animals respond to environmental stimuli obtained through their sensory organs. How does the body convert information from the environment to an internal response?

Choices:
A. increased cellular temperature
B. selective membrane transport
C. chemical signaling
D. osmotic pressure

Answer: C

Question: Animals respond to environmental stimuli obtained through their sensory organs. How does the body convert information from the environment to an internal response?
Answer:


Question: The Sun is classified as

Choices:
A. an organism
B. a decomposer
C. a star
D. a planet

Answer: C

Question: The Sun is classified as
Answer:


Question: A student in science class finds an unlabeled bottle containing a liquid. For safety purposes the student should

Choices:
A. tell the teacher about the bottle and liquid.
B. pour the liquid down the drain.
C. compare the liquid to other liquids.
D. find the mass of the bottle and liquid.

Answer: A

tell the teacher about the bottle and liquid.

Question: A student in science class finds an unlabeled bottle containing a liquid. For safety purposes the student should
Answer:


Question: Over a long time, oil can form when layers of sediment push down on decomposing

Choices:
A. trees.
B. animals.
C. fungi.
D. algae.

Answer: D

Question: Over a long time, oil can form when layers of sediment push down on decomposing
Answer:


Question: Students measured how long it took for an ice cube to melt. Which measurement best represents how long it took for the ice cube to melt?

Choices:
A. 20° Celsius
B. 40 grams
C. 60 milliliters
D. 80 seconds

Answer: D

Question: Students measured how long it took for an ice cube to melt. Which measurement best represents how long it took for the ice cube to melt?
Answer:


Question: What is the primary source of stored thermal energy in oceans?

Choices:
A. sunlight
B. plankton
C. volcanoes
D. hurricanes

Answer: A

Question: What is the primary source of stored thermal energy in oceans?
Answer:


Question: Which is not considered an instrument to be used to determine weather?

Choices:
A. a barometer
B. a thermometer
C. an anemometer
D. a millimeter

Answer: D

Question: Which is not considered an instrument to be used to determine weather?
Answer:


Question: Which process in the water cycle is directly caused by the heat from the Sun?

Choices:
A. evaporation
B. runoff
C. cloud formation
D. stream flow

Answer: A

Question: Which process in the water cycle is directly caused by the heat from the Sun?
Answer:


Question: A marine iguana is an animal that lives on the shoreline of warm islands. Its tail is long and thick. Which of these is improved by the shape of its tail?

Choices:
A. swimming in the ocean
B. blending in with rocks
C. absorbing nutrients
D. finding food inland

Answer: A

Question: A marine iguana is an animal that lives on the shoreline of warm islands. Its tail is long and thick. Which of these is improved by the shape of its tail?
Answer:


Question: The Appalachian Mountains, which extend from Canada to Alabama, were much taller in the past than they are today. Which of the following two processes are most responsible for the decrease in the height of the Appalachian Mountains?

Choices:
A. weathering and erosion
B. sedimentation and flooding
C. volcanic eruptions and landslides
D. tectonic collisions and earthquakes

Answer: A

Question: The Appalachian Mountains, which extend from Canada to Alabama, were much taller in the past than they are today. Which of the following two processes are most responsible for the decrease in the height of the Appalachian Mountains?
Answer:


Question: Which of these items is designed to produce heat from electricity?

Choices:
A. a toaster
B. a camera
C. a blender
D. a television

Answer: A

Question: Which of these items is designed to produce heat from electricity?
Answer:


Question: Which tool is the best to use when studying small organisms not visible to the eye?

Choices:
A. telescope
B. hand lens
C. microscope
D. magnifying glass

Answer: C

Question: Which tool is the best to use when studying small organisms not visible to the eye?
Answer:


Question: Which process involves choosing certain organisms to reproduce with one another in order to pass on specific, desirable traits to their offspring?

Choices:
1. selective breeding
2. asexual reproduction
3. resource acquisition
4. natural selection

Answer: 1

Question: Which process involves choosing certain organisms to reproduce with one another in order to pass on specific, desirable traits to their offspring?
Answer:


Question: Which pair of terms describes the usual location for fertilization and the first stages of development in human reproduction?

Choices:
1. external fertilization and external development
2. external fertilization and internal development
3. internal fertilization and external development
4. internal fertilization and internal development

Answer: 4

internal fertilization and internal development

Question: Which pair of terms describes the usual location for fertilization and the first stages of development in human reproduction?
Answer:


Question: Which terms are both used to describe the weather?

Choices:
A. gravity and wind direction
B. precipitation and runoff
C. groundwater and erosion
D. air temperature and wind speed

Answer: D

Question: Which terms are both used to describe the weather?
Answer:


Question: Which is an example of a hypothesis?

Choices:
A. Large mice will eat more food than smaller mice.
B. One flower was measured to be 13 centimeters tall.
C. On a dark night, a student counted hundreds of stars.
D. People should be careful to protect endangered animals.

Answer: A

Large mice will eat more food than smaller mice.

Question: Which is an example of a hypothesis?
Answer:


Question: Charles Darwin made a number of observations and inferences during his travels. He studied island finches during a long period of time. Which statement is an inference?

Choices:
A. Individual birds have different colored feathers.
B. Island finches have a large number of offspring.
C. Individual birds of an island finch species have many differences.
D. Island finches share a common ancestry with mainland finch species.

Answer: D

Island finches share a common ancestry with mainland finch species.

Question: Charles Darwin made a number of observations and inferences during his travels. He studied island finches during a long period of time. Which statement is an inference?
Answer:


Question: In what respect are protons and electrons always equal?

Choices:
A. mass number
B. kinetic energy
C. sign of charge
D. magnitude of charge

Answer: D

Question: In what respect are protons and electrons always equal?
Answer:


Question: A sea anemone uses poisonous darts to

Choices:
A. absorb food.
B. defend itself.
C. attract a mate.
D. protect its young.

Answer: B

Question: A sea anemone uses poisonous darts to
Answer:


Question: Which process causes sand grains to stick together to form sandstone?

Choices:
A. abrasion
B. cementation
C. combustion
D. erosion

Answer: B

Question: Which process causes sand grains to stick together to form sandstone?
Answer:


Question: George is studying erosion. He learns how rocks break apart over time. Which of these most likely forms when a rock weathers and breaks into small pieces?

Choices:
A. fossils
B. crystals
C. minerals
D. sediments

Answer: D

Question: George is studying erosion. He learns how rocks break apart over time. Which of these most likely forms when a rock weathers and breaks into small pieces?
Answer:


Question: Which discovery was necessary before radio could be invented?

Choices:
A. reflection
B. radiation
C. electricity
D. gravity

Answer: C

Question: Which discovery was necessary before radio could be invented?
Answer:


Question: The human body has different levels of organization. In the structural organization of the central nervous system, which is an organ?

Choices:
A. brain
B. grey matter
C. nerve
D. neuron

Answer: A

Question: The human body has different levels of organization. In the structural organization of the central nervous system, which is an organ?
Answer:


Question: Which activity requires the use of safety goggles to protect the eyes?

Choices:
A. collecting rain water
B. measuring air temperature
C. classifying flowers
D. pouring vinegar

Answer: D

Question: Which activity requires the use of safety goggles to protect the eyes?
Answer:


Question: Recently the telephone company announced the implementation of a new telephone area code for Massachusetts. What technological changes are responsible for the need for a new area code?

Choices:
A. the increased size of the telephone book
B. the increase in use of modems, fax machines, and cellular phones
C. the increase in use of speed dialing and call waiting
D. the increased demand for telephone repairs and installation

Answer: B

the increase in use of modems, fax machines, and cellular phones

Question: Recently the telephone company announced the implementation of a new telephone area code for Massachusetts. What technological changes are responsible for the need for a new area code?
Answer:


Question: Sediment that is deposited on a beach may come from a local source or be transported by which action?

Choices:
A. swash
B. rip currents
C. river currents
D. longshore drift

Answer: D

Question: Sediment that is deposited on a beach may come from a local source or be transported by which action?
Answer:


Question: Which of the following is the main reason water at the surface of the ocean is warmer than water at the bottom of the ocean?

Choices:
A. Water at the bottom of the ocean contains more dissolved solids.
B. Water at the surface of the ocean absorbs more energy from the Sun.
C. Friction is created by fast moving currents at the surface of the ocean.
D. Wave action transfers heat from the bottom of the ocean to the surface.

Answer: B

Water at the surface of the ocean absorbs more energy from the Sun.

Question: Which of the following is the main reason water at the surface of the ocean is warmer than water at the bottom of the ocean?
Answer:


Question: A research team has made new discoveries about magnetism. Which of these statements best describes the value to society of publishing their discoveries?

Choices:
A. Their results will be unchangeable.
B. The research team may become famous.
C. The publishing company may make money.
D. Their discoveries can be built on by other researchers.

Answer: D

Their discoveries can be built on by other researchers.

Question: A research team has made new discoveries about magnetism. Which of these statements best describes the value to society of publishing their discoveries?
Answer:


Question: Which of these is the BEST way to save animals and trees?

Choices:
A. Ride bikes more
B. Make more farmland
C. Take care of forests
D. Move to the city

Answer: C

Question: Which of these is the BEST way to save animals and trees?
Answer:


Question: Which of these cell types has DNA that is not bound in a nuclear membrane?

Choices:
A. a plant cell
B. a protist cell
C. an animal cell
D. a prokaryote cell

Answer: D

Question: Which of these cell types has DNA that is not bound in a nuclear membrane?
Answer:


Question: Ann makes hats for people. She has each person select the fabric and a hat style before she makes the hat to fit the person's head size. Which type of manufacturing system is Ann most likely using to make hats?

Choices:
A. mass production
B. custom production
C. automated production
D. assembly line production

Answer: B

Question: Ann makes hats for people. She has each person select the fabric and a hat style before she makes the hat to fit the person's head size. Which type of manufacturing system is Ann most likely using to make hats?
Answer:


Question: The number of neutrons in an atom is found by subtracting

Choices:
A. atomic number from mass number.
B. mass number from atomic number.
C. atomic number from electron number.
D. isotope number from electron number.

Answer: A

Question: The number of neutrons in an atom is found by subtracting
Answer:


Question: All energy resources have benefits, risks, and drawbacks. Which two resources present the most dangerous risks and consequences for the environment during their acquisition?

Choices:
A. oil and coal
B. coal and solar energy
C. geothermal energy and oil
D. solar energy and geothermal energy

Answer: A

Question: All energy resources have benefits, risks, and drawbacks. Which two resources present the most dangerous risks and consequences for the environment during their acquisition?
Answer:


Question: The appearance of the Moon as observed from Earth changes over time because of the Moon's

Choices:
A. path around Earth
B. length of daylight
C. gravity
D. temperature

Answer: A

Question: The appearance of the Moon as observed from Earth changes over time because of the Moon's
Answer:


Question: Which is the best conductor of electricity?

Choices:
A. air
B. glass
C. water
D. wood

Answer: C

Question: Which is the best conductor of electricity?
Answer:


Question: What is one of the major advantages of using hydroelectric power?

Choices:
A. It uses renewable natural resources.
B. It is easily generated in most big cities.
C. It can be generated from any area on Earth.
D. It does not require special buildings or equipment.

Answer: A

Question: What is one of the major advantages of using hydroelectric power?
Answer:


Question: When coal is burned to produce electricity, the electrical energy produced is less than the potential energy in the coal. Which best explains this observation?

Choices:
A. As coal is heated, some of the molecules move so fast that they are destroyed.
B. Some of the energy in coal is destroyed by the intense heat required to release its potential energy.
C. Some of the potential energy in coal is converted into forms of energy other than electricity.
D. The amount of potential energy in fuels is overestimated.

Answer: C

Some of the potential energy in coal is converted into forms of energy other than electricity.

Question: When coal is burned to produce electricity, the electrical energy produced is less than the potential energy in the coal. Which best explains this observation?
Answer:


Question: The density of a material can be measured by using a

Choices:
A. meter stick and test tubes.
B. beaker and stopwatch.
C. thermometer and computer probes.
D. balance and graduated cylinder.

Answer: D

Question: The density of a material can be measured by using a
Answer:


Question: Evan is performing an investigation. Before conducting his investigation, what must Evan do?

Choices:
A. record his observations
B. develop a hypothesis
C. reach a conclusion
D. organize the data

Answer: B

Question: Evan is performing an investigation. Before conducting his investigation, what must Evan do?
Answer:


Question: A model of an atom includes red marbles for electrons, green marbles for protons, and blue marbles for neutrons. All marbles have a radius of 2 cm. How could the model be changed to represent more properties of an atom?

Choices:
A. by using smaller marbles to represent electrons
B. by using two marbles to represent each neutron
C. by using two differently colored marbles for protons
D. by switching the colors of the marbles

Answer: A

by using smaller marbles to represent electrons

Question: A model of an atom includes red marbles for electrons, green marbles for protons, and blue marbles for neutrons. All marbles have a radius of 2 cm. How could the model be changed to represent more properties of an atom?
Answer:


Question: The charge of the nucleus of an atom is due to the presence of

Choices:
A. positive protons.
B. negative neutrons.
C. negative protons and positive electrons.
D. positive protons and negative neutrons.

Answer: A

Question: The charge of the nucleus of an atom is due to the presence of
Answer:


Question: The shape of a riverbed changes over time as a result of which gradual process?

Choices:
A. erosion
B. dissolving
C. plate shifting
D. compaction

Answer: A

Question: The shape of a riverbed changes over time as a result of which gradual process?
Answer:


Question: Which best explains why it is important for a doctor's office to keep accurate records of the medicines prescribed for their patients?

Choices:
A. to know how many people take medicines
B. to keep track of all of the people who are sick
C. to keep track of the next scheduled appointments
D. to know if there is a risk for harmful side effects

Answer: D

to know if there is a risk for harmful side effects

Question: Which best explains why it is important for a doctor's office to keep accurate records of the medicines prescribed for their patients?
Answer:


Question: Sodium chloride (NaCl) is formed in a chemical reaction between sodium (Na) and chlorine (Cl_{2}). What is sodium chloride?

Choices:
A. an element
B. a mixture
C. a compound
D. an atom

Answer: C

Question: Sodium chloride (NaCl) is formed in a chemical reaction between sodium (Na) and chlorine (Cl_{2}). What is sodium chloride?
Answer:


Question: Which two processes are common to all living things?

Choices:
A. flying and breathing
B. migrating and reproducing
C. using nutrients and growing
D. eliminating waste and hibernating

Answer: C

Question: Which two processes are common to all living things?
Answer:


Question: Which health condition is an infectious disease?

Choices:
1. pneumonia caused by microorganisms
2. heart problem caused by a high-fat diet
3. lung cancer caused by smoking
4. eye damage caused by ultraviolet light

Answer: 1

Question: Which health condition is an infectious disease?
Answer:


Question: A leaf is covered in mud during a landslide. After one million years, this leaf will most likely be ___.

Choices:
A. a fossil
B. an animal species
C. a new plant species
D. a nonrenewable fuel

Answer: A

Question: A leaf is covered in mud during a landslide. After one million years, this leaf will most likely be ___.
Answer:


Question: Computers have devices called heat sinks designed to lower the temperature of a computer by scattering produced heat into the surrounding area. Which type of energy is kept away from a computer by a heat sink?

Choices:
A. electrical
B. chemical
C. thermal
D. nuclear

Answer: C

Question: Computers have devices called heat sinks designed to lower the temperature of a computer by scattering produced heat into the surrounding area. Which type of energy is kept away from a computer by a heat sink?
Answer:


Question: Which of the following is the best example of a part of the propulsion system of a tractor?

Choices:
A. engine
B. front headlight
C. hood
D. steering wheel

Answer: A

Question: Which of the following is the best example of a part of the propulsion system of a tractor?
Answer:


Question: Approximately what percentage of the electromagnetic spectrum is visible light?

Choices:
A. more than 75%
B. 50%
C. 25%
D. less than 10%

Answer: D

Question: Approximately what percentage of the electromagnetic spectrum is visible light?
Answer:


Question: Which occurs as a result of the rotation of Earth about its own axis?

Choices:
A. the water cycle
B. seasons of the year
C. sunrises and sunsets
D. global climate changes

Answer: C

Question: Which occurs as a result of the rotation of Earth about its own axis?
Answer:


Question: Where is water most likely to be brackish?

Choices:
A. sea
B. lake
C. river
D. estuary

Answer: D

Question: Where is water most likely to be brackish?
Answer:


Question: Which method would be best for scientists to use to determine the absolute age of a Precambrian igneous rock?

Choices:
A. index fossils
B. law of superposition
C. radiometric dating
D. law of original horizontality

Answer: C

Question: Which method would be best for scientists to use to determine the absolute age of a Precambrian igneous rock?
Answer:


Question: Which cellular structure in an animal cell helps maintain homeostasis by controlling the transportation of substances into and out of the cell?

Choices:
A. vacuole
B. cell wall
C. mitochondrion
D. cell membrane

Answer: D

Question: Which cellular structure in an animal cell helps maintain homeostasis by controlling the transportation of substances into and out of the cell?
Answer:


Question: Moths undergo complete metamorphosis. Which stages does a moth's life cycle include?

Choices:
A. egg, larva, and pupa
B. egg, nymph, and pupa
C. nymph, larva, and pupa
D. nymph, egg, and larva

Answer: A

Question: Moths undergo complete metamorphosis. Which stages does a moth's life cycle include?
Answer:


Question: Maryland has many renewable and nonrenewable natural resources. Which group contains only renewable resources found in Maryland?

Choices:
A. wind, oil, coal
B. fish, coal, wind
C. oil, water, trees
D. trees, water, fish

Answer: D

Question: Maryland has many renewable and nonrenewable natural resources. Which group contains only renewable resources found in Maryland?
Answer:


Question: A lizard in a desert sits on a warm rock. Where does the heat energy in the rock come from?

Choices:
A. the Sun
B. the lizard's skin
C. deep within Earth
D. the decay of plant materials

Answer: A

Question: A lizard in a desert sits on a warm rock. Where does the heat energy in the rock come from?
Answer:


Question: Which of the following is broken down in the body to release energy?

Choices:
A. sugar.
B. water.
C. salt.
D. oxygen.

Answer: A

Question: Which of the following is broken down in the body to release energy?
Answer:


Question: The teacher heats a pot of water. Once the water reaches 100°C, which point has the water reached?

Choices:
A. boiling
B. melting
C. freezing
D. evaporating

Answer: A

Question: The teacher heats a pot of water. Once the water reaches 100°C, which point has the water reached?
Answer:


Question: A tick attaches to a deer and consumes blood, harming the deer. This is an example of which type of relationship?

Choices:
A. predator-prey
B. mutualism
C. parasite-host
D. commensalism

Answer: C

Question: A tick attaches to a deer and consumes blood, harming the deer. This is an example of which type of relationship?
Answer:


Question: Which organisms contribute most to the decomposition of dead organisms?

Choices:
A. snakes
B. viruses
C. insects
D. bacteria

Answer: D

Question: Which organisms contribute most to the decomposition of dead organisms?
Answer:


Question: In 1785, James Hutton, stated that evidence of past occurrences can be used to explain events which happen today. Which could most likely be used to explain an event in the geologic past?

Choices:
A. sunspots
B. earthquakes
C. wave patterns
D. cloud formations

Answer: B

Question: In 1785, James Hutton, stated that evidence of past occurrences can be used to explain events which happen today. Which could most likely be used to explain an event in the geologic past?
Answer:


Question: Which action is a learned characteristic of a newborn horse?

Choices:
A. nursing
B. walking
C. sleeping
D. breathing

Answer: B

Question: Which action is a learned characteristic of a newborn horse?
Answer:


Question: In an ocean ecosystem, dead organisms such as fish and plankton sink to the bottom of the ocean. Which organisms break down and recycle the dead organisms?

Choices:
A. algae
B. bacteria
C. mollusks
D. sponges

Answer: B

Question: In an ocean ecosystem, dead organisms such as fish and plankton sink to the bottom of the ocean. Which organisms break down and recycle the dead organisms?
Answer:


Question: A student is conducting an investigation using chemicals. Other than goggles and gloves, what else should the student use in order to conduct this investigation safely?

Choices:
A. lab coat
B. Petri dish
C. Bunsen burner
D. loose-fitting clothing

Answer: A

Question: A student is conducting an investigation using chemicals. Other than goggles and gloves, what else should the student use in order to conduct this investigation safely?
Answer:


Question: Humans use both renewable and nonrenewable resources. Which human activity uses a nonrenewable resource?

Choices:
A. building houses with wood
B. using natural gas to heat homes
C. using solar energy to power lights
D. producing electricity from flowing water

Answer: B

Question: Humans use both renewable and nonrenewable resources. Which human activity uses a nonrenewable resource?
Answer:


Question: Which of these is a natural resource of Virginia?

Choices:
A. A dam
B. A glacier
C. A river
D. A power plant

Answer: C

Question: Which of these is a natural resource of Virginia?
Answer:


Question: A wild turkey's forest community includes

Choices:
A. insects
B. rainfall
C. soil
D. wind

Answer: A

Question: A wild turkey's forest community includes
Answer:


Question: How long does it take light from the nearest star other than the Sun to reach Earth?

Choices:
A. Less than 1 second
B. About 1 hour
C. About 1 month
D. About 4 years

Answer: D

Question: How long does it take light from the nearest star other than the Sun to reach Earth?
Answer:


Question: At certain times of the year, meteor showers can be observed from Earth. Why are these objects from space usually harmless?

Choices:
A. They are always microscopic.
B. They are closer to the sun than to Earth.
C. They are made of soft, spongy materials.
D. They burn up high in Earth's atmosphere

Answer: D

Question: At certain times of the year, meteor showers can be observed from Earth. Why are these objects from space usually harmless?
Answer:


Question: A student ties a string around a weight and swings the weight in a circle around her body. If the student represents the Sun and the weight represents Earth, what does the string represent?

Choices:
A. gravity
B. radiation
C. electricity
D. magnetism

Answer: A

Question: A student ties a string around a weight and swings the weight in a circle around her body. If the student represents the Sun and the weight represents Earth, what does the string represent?
Answer:


Question: Which statement best describes how a mountain range changes over time from wind and water erosion?

Choices:
A. The mountain range will become faulted.
B. The mountain range will be lifted up.
C. The mountain range will form craters.
D. The mountain range will become rounded.

Answer: D

Question: Which statement best describes how a mountain range changes over time from wind and water erosion?
Answer:


Question: Which action represents the use of technology to solve a problem?

Choices:
A. reducing the amount of heartburn with the use of herbal teas
B. answering mathematical equations with the use of computers
C. bringing down body temperature with the use of a hand fan
D. increasing the supply of fish with the use of fish farms

Answer: B

answering mathematical equations with the use of computers

Question: Which action represents the use of technology to solve a problem?
Answer:


Question: During the year, the angle at which the path of the Sun appears in the sky varies. In the Northern Hemisphere, the path of the Sun appears higher on the horizon during the summer and lower on the horizon during the winter. Which factor most contributes to the variation in the path of the Sun across the sky?

Choices:
A. the rotation of Earth
B. the tilted axis of Earth
C. the flattening of Earth at the poles
D. the elliptical shape of the orbit of Earth

Answer: B

Question: During the year, the angle at which the path of the Sun appears in the sky varies. In the Northern Hemisphere, the path of the Sun appears higher on the horizon during the summer and lower on the horizon during the winter. Which factor most contributes to the variation in the path of the Sun across the sky?
Answer:


Question: Which feature is most likely the result of a flowing river?

Choices:
A. a sand dune
B. a volcano
C. a canyon
D. a glacier

Answer: C

Question: Which feature is most likely the result of a flowing river?
Answer:


Question: Which of the following statements is true about organisms that are producers?

Choices:
A. They use energy from the sun to make food.
B. They absorb energy from a host animal.
C. They get energy from eating living animals.
D. They get energy by breaking down dead plants and animals.

Answer: A

They use energy from the sun to make food.

Question: Which of the following statements is true about organisms that are producers?
Answer:


Question: When rock particles settle at the bottom of the ocean, they can continue to be buried by other particles. The process of cementation of these particles forms

Choices:
A. molten rocks.
B. igneous rocks.
C. sedimentary rocks.
D. metamorphic rocks.

Answer: C

Question: When rock particles settle at the bottom of the ocean, they can continue to be buried by other particles. The process of cementation of these particles forms
Answer:


Question: Which is the correct sequence for the stages in the life cycle of a butterfly?

Choices:
A. larva; pupa; egg; adult
B. egg; pupa; larva; adult
C. adult; larva; pupa; egg
D. egg; larva; pupa; adult

Answer: D

Question: Which is the correct sequence for the stages in the life cycle of a butterfly?
Answer:


Question: Parakeets are birds whose basic plumage color is green. However, parakeets exhibit a wide range of color both in the wild and in captivity. Which process is the source of the wide color variation observed in parakeet populations?

Choices:
A. speciation
B. adaptation
C. natural selection
D. genetic mutation

Answer: D

Question: Parakeets are birds whose basic plumage color is green. However, parakeets exhibit a wide range of color both in the wild and in captivity. Which process is the source of the wide color variation observed in parakeet populations?
Answer:


Question: Which environment is best for an organism that sleeps during the day and digs holes in the ground for shelter?

Choices:
A. wetland
B. rainforest
C. tundra
D. desert

Answer: D

Question: Which environment is best for an organism that sleeps during the day and digs holes in the ground for shelter?
Answer:


Question: Chris stirs a cup of hot chocolate. He uses a wooden stick thinking it will stay cooler than a metal spoon. Which activity best describes the student's action?

Choices:
A. comparing data
B. asking a question
C. making a prediction
D. forming a conclusion

Answer: C

Question: Chris stirs a cup of hot chocolate. He uses a wooden stick thinking it will stay cooler than a metal spoon. Which activity best describes the student's action?
Answer:


Question: The layered mixture of gases surrounding Earth is called the

Choices:
1. atmosphere
2. hydrosphere
3. lithosphere
4. hemisphere

Answer: 1

Question: The layered mixture of gases surrounding Earth is called the
Answer:


Question: Which of these can make a shadow on the ground during the day?

Choices:
A. River
B. Air
C. Thunder
D. Cloud

Answer: D

Question: Which of these can make a shadow on the ground during the day?
Answer:


Question: Which two body systems would most directly remove extra fluid from a person's lungs?

Choices:
A. nervous and digestive
B. nervous and circulatory
C. respiratory and digestive
D. respiratory and circulatory

Answer: D

Question: Which two body systems would most directly remove extra fluid from a person's lungs?
Answer:


Question: Which system produces most of the hormones in the human body?

Choices:
1. circulatory
2. digestive
3. endocrine
4. respiratory

Answer: 3

Question: Which system produces most of the hormones in the human body?
Answer:


Question: Mangrove trees are affected by several factors. Which is an abiotic factor contributing to the energy cycle of a mangrove ecosystem?

Choices:
A. bacteria
B. climate
C. fungi
D. rocks

Answer: B

Question: Mangrove trees are affected by several factors. Which is an abiotic factor contributing to the energy cycle of a mangrove ecosystem?
Answer:


Question: Which Earth movement results in day and night?

Choices:
A. erosion
B. deposition
C. revolution
D. rotation

Answer: D

Question: Which Earth movement results in day and night?
Answer:


Question: The U.S. Environmental Protection Agency (EPA) was established in 1970 to address problems that existed in the environment. Which is the EPA most likely interested in reducing?

Choices:
A. the emissions from volcanic activity
B. the level of pollution caused by people
C. the amount of ozone in the stratosphere
D. the amount of oxygen produced by trees

Answer: B

Question: The U.S. Environmental Protection Agency (EPA) was established in 1970 to address problems that existed in the environment. Which is the EPA most likely interested in reducing?
Answer:


Question: Which type of model best shows the location of underwater ocean ridges?

Choices:
A. world globe
B. satellite map
C. topographic map
D. nautical chart

Answer: C

Question: Which type of model best shows the location of underwater ocean ridges?
Answer:


Question: What happens to colored sugar when it is added to water?

Choices:
A. The sugar reacts and colors the water.
B. The sugar becomes white and the water changes color.
C. The sugar evaporates and the water changes color.
D. The sugar dissolves and colors the water.

Answer: D

The sugar dissolves and colors the water.

Question: What happens to colored sugar when it is added to water?
Answer:


Question: A farmer predicts a new sprinkler will keep water from being wasted. What term best describes this prediction?

Choices:
A. experiment
B. hypothesis
C. observation
D. variable

Answer: B

Question: A farmer predicts a new sprinkler will keep water from being wasted. What term best describes this prediction?
Answer:


Question: The electromagnetic spectrum is described as a

Choices:
A. series of colors of the rainbow.
B. list of radioactive elements.
C. band of frequencies of light waves.
D. range of conductivity of metals.

Answer: C

Question: The electromagnetic spectrum is described as a
Answer:


Question: Two high tides and two low tides occur on Earth every

Choices:
A. day.
B. hour.
C. week.
D. month.

Answer: A

Question: Two high tides and two low tides occur on Earth every
Answer:


Question: Deposition of sediment during floods makes the land near some rivers

Choices:
A. acidic.
B. fertile.
C. hilly.
D. unstable.

Answer: B

Question: Deposition of sediment during floods makes the land near some rivers
Answer:


Question: The relationship between ticks and a dog can best be described as

Choices:
A. mutualism.
B. competition.
C. parasitism.
D. commensalism.

Answer: C

Question: The relationship between ticks and a dog can best be described as
Answer:


Question: A student in a laboratory transfers a beaker containing a hot solution from the lab table to a cool water bath. Which of the following parts of the system experiences an increase in heat energy?

Choices:
A. beaker
B. lab table
C. solution
D. water bath

Answer: D

Question: A student in a laboratory transfers a beaker containing a hot solution from the lab table to a cool water bath. Which of the following parts of the system experiences an increase in heat energy?
Answer:


Question: Some individuals are unable to digest the lactose found in the milk of cows. The digestive systems of these individuals most likely lack which?

Choices:
A. a lipid that coats lactose molecules
B. an ability to produce lactose internally
C. an enzyme that catalyzes lactose breakdown
D. a tolerance to lactose developed during childhood

Answer: C

an enzyme that catalyzes lactose breakdown

Question: Some individuals are unable to digest the lactose found in the milk of cows. The digestive systems of these individuals most likely lack which?
Answer:


Question: Muscle cells need to quickly convert energy from food molecules into a usable form. For this reason, which of the following do muscle cells have in greater numbers than most other types of cells?

Choices:
A. chromosomes
B. mitochondria
C. nuclei
D. vacuoles

Answer: B

Question: Muscle cells need to quickly convert energy from food molecules into a usable form. For this reason, which of the following do muscle cells have in greater numbers than most other types of cells?
Answer:


Question: When mountains are formed, there is an interaction between areas of Earth. Which two will interact and result in the formation of mountains?

Choices:
A. hydrosphere and biosphere
B. troposphere and ionosphere
C. hydrosphere and lithosphere
D. asthenosphere and lithosphere

Answer: D

Question: When mountains are formed, there is an interaction between areas of Earth. Which two will interact and result in the formation of mountains?
Answer:


Question: Which statement describes a primary function of the cell wall of a plant cell?

Choices:
A. The cell wall performs photosynthesis.
B. The cell wall stores DNA.
C. The cell wall provides structural support.
D. The cell wall manufactures proteins.

Answer: C

The cell wall provides structural support.

Question: Which statement describes a primary function of the cell wall of a plant cell?
Answer:


Question: In the 1970s, the pesticide DDT was used to kill insects that damaged fruit and vegetable crops. Most insects died from being exposed to DDT, but some survived. These surviving insects contributed to an increase in their population by

Choices:
A. migrating to habitats that had different types of crops.
B. learning how to avoid being exposed to DDT.
C. passing the gene for DDT resistance to their offspring.
D. competing with other types of insects for food.

Answer: C

passing the gene for DDT resistance to their offspring.

Question: In the 1970s, the pesticide DDT was used to kill insects that damaged fruit and vegetable crops. Most insects died from being exposed to DDT, but some survived. These surviving insects contributed to an increase in their population by
Answer:


Question: Where does air go when a person breathes in?

Choices:
A. Into the heart
B. Into the stomach
C. Into the lungs
D. Into the liver

Answer: C

Question: Where does air go when a person breathes in?
Answer:


Question: The conservation of matter can be demonstrated by using chemical equations. Which chemical equation demonstrates the conservation of matter?

Choices:
A. 2Sn + 4HNO_{3} -> SnO_{2} + 4NO_{2} + H_{2}O
B. I_{2} + 5Cl_{2} + 6H_{2}O -> 2HIO_{3} + 10HCl
C. Cl + 4Na -> 4NaCl
D. 4P + 5HNO_{3} -> 5NO + 3H_{3}PO_{4}

Answer: B

Question: The conservation of matter can be demonstrated by using chemical equations. Which chemical equation demonstrates the conservation of matter?
Answer:


Question: Abnormal cell division in humans may result in

Choices:
1. cancer
2. fertilization
3. asexual reproduction
4. dynamic equilibrium

Answer: 1

Question: Abnormal cell division in humans may result in
Answer:


Question: What property of electromagnetic waves makes it possible to use these waves to transmit information between a space shuttle and NASA mission control centers on the ground?

Choices:
A. Electromagnetic waves are transverse waves.
B. Electromagnetic waves have very low velocity.
C. Electromagnetic waves are all visible to human eyes.
D. Electromagnetic waves can travel through a vacuum.

Answer: D

Electromagnetic waves can travel through a vacuum.

Question: What property of electromagnetic waves makes it possible to use these waves to transmit information between a space shuttle and NASA mission control centers on the ground?
Answer:


Question: Both prokaryotes and eukaryotes have small, free-floating organelles. The cell makes these organelles from nucleic acids and amino acids found in food. Without these organelles, the cell could not make proteins. What are these organelles called?

Choices:
A. chloroplasts
B. mitochondria
C. ribosomes
D. vesicles

Answer: C

Question: Both prokaryotes and eukaryotes have small, free-floating organelles. The cell makes these organelles from nucleic acids and amino acids found in food. Without these organelles, the cell could not make proteins. What are these organelles called?
Answer:


Question: Chloroplasts in cells make it possible for the cells to

Choices:
A. reproduce.
B. hold their rigid shape.
C. absorb and excrete materials.
D. carry out photosynthesis.

Answer: D

Question: Chloroplasts in cells make it possible for the cells to
Answer:


Question: What is the main advantage of making a laptop computer light in weight?

Choices:
A. to make it easy to carry
B. to keep it simple to build
C. to make the screen easy to read
D. to provide storage for an electrical cord

Answer: A

Question: What is the main advantage of making a laptop computer light in weight?
Answer:


Question: Which event below involves a constructive force?

Choices:
A. earthquake
B. volcanic eruption
C. flood
D. wind storm

Answer: B

Question: Which event below involves a constructive force?
Answer:


Question: The number of stars in the Milky Way Galaxy is best estimated as

Choices:
A. one hundred thousand.
B. one hundred million.
C. one hundred billion.
D. one hundred trillion.

Answer: C

Question: The number of stars in the Milky Way Galaxy is best estimated as
Answer:


Question: In a forest ecosystem, the squirrels eat seeds from trees. The squirrels are then eaten by hawks, owls, and foxes. If there were no more owls present in this ecosystem, which would most likely happen in the forest?

Choices:
A. The squirrel population would increase.
B. The hawk population would decrease.
C. The fox population would decrease.
D. The tree population would increase.

Answer: A

Question: In a forest ecosystem, the squirrels eat seeds from trees. The squirrels are then eaten by hawks, owls, and foxes. If there were no more owls present in this ecosystem, which would most likely happen in the forest?
Answer:


Question: A bird builds a nest to

Choices:
A. hibernate in winter
B. shelter its offspring
C. produce more feathers
D. eliminate waste

Answer: B

Question: A bird builds a nest to
Answer:


Question: Sydney is learning about the sources of energy that can run out. Which energy source will run out the fastest?

Choices:
A. flowing water
B. natural gas
C. sunlight
D. wind

Answer: B

Question: Sydney is learning about the sources of energy that can run out. Which energy source will run out the fastest?
Answer:


Question: Which two life processes occur in both plants and humans?

Choices:
A. growing and reproducing
B. germinating and making food
C. growing and making food
D. germinating and reproducing

Answer: A

Question: Which two life processes occur in both plants and humans?
Answer:


Question: Observation and measurement are important to scientific investigations because

Choices:
A. they are part of the instructions.
B. they are used to test a hypothesis.
C. they are required to make a hypothesis.
D. they keep you safe during an investigation.

Answer: B

Question: Observation and measurement are important to scientific investigations because
Answer:


Question: One end of a metal rod is placed over a flame during an investigation. A thermometer is touching the opposite end of the metal rod. Which best describes what is happening during this investigation?

Choices:
A. Convection carries heat to the thermometer.
B. Radiant energy warms the thermometer.
C. Mechanical energy from the flame carries heat to the thermometer.
D. Heat from the flame is conducted through the metal rod to the thermometer.

Answer: D

Heat from the flame is conducted through the metal rod to the thermometer.

Question: One end of a metal rod is placed over a flame during an investigation. A thermometer is touching the opposite end of the metal rod. Which best describes what is happening during this investigation?
Answer:


Question: When a volcano erupts, new lava is deposited on the slopes of the volcano. After the lava cools and hardens, which types of organisms will most likely be the first to live on the new material?

Choices:
A. large reptiles and amphibians
B. small birds and mammals
C. mosses and lichens
D. bushes and vines

Answer: C

Question: When a volcano erupts, new lava is deposited on the slopes of the volcano. After the lava cools and hardens, which types of organisms will most likely be the first to live on the new material?
Answer:


Question: Which activity illustrates the main function of the motor neuron complex?

Choices:
A. transferring impulses to the appropriate muscle
B. receiving sensory impulses from the environment
C. delivering regular impulses to the autonomic system
D. processing impulses within the cerebral cortex

Answer: A

transferring impulses to the appropriate muscle

Question: Which activity illustrates the main function of the motor neuron complex?
Answer:


Question: Which would be a safe practice to exercise during laboratory investigations?

Choices:
A. using open flames to heat all materials
B. keeping your cell phone on the laboratory countertop
C. knowing where your instructor/laboratory leader is at all times
D. removing your safety glasses when moving from station to station

Answer: C

knowing where your instructor/laboratory leader is at all times

Question: Which would be a safe practice to exercise during laboratory investigations?
Answer:


Question: To express the distance between the Milky Way galaxy and other galaxies, the most appropriate unit of measurement is the

Choices:
A. meter.
B. kilometer.
C. light-year.
D. astronomical unit.

Answer: C

Question: To express the distance between the Milky Way galaxy and other galaxies, the most appropriate unit of measurement is the
Answer:


Question: Which of these will most likely harm a habitat?

Choices:
A. planting trees
B. water pollution
C. rainfall
D. sunlight

Answer: B

Question: Which of these will most likely harm a habitat?
Answer: