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Middle School Science Praxis 5442 Questions and Answers Latest Version Graded A+
What is the main function of the mitochondria in a cell?✔✔It produces energy through cellular respiration.
Why do objects fall toward the Earth?✔✔Because of the force of gravity pulling them down.
How does the water cycle move water through the environment?✔✔Through processes like evaporation, condensation, precipitation, and runoff.
What is the difference between a physical change and a chemical change?✔✔A physical change alters the form or appearance, while a chemical change creates a new substance.
Why do plants appear green?✔✔Because chlorophyll absorbs other colors of light and reflects green. 1 / 4
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What causes seasons on Earth?✔✔The tilt of Earth's axis as it orbits the sun causes seasonal changes.
How do fossils provide evidence for evolution?✔✔They show changes in species over time through preserved remains.
What is the role of decomposers in an ecosystem?✔✔They break down dead organisms and recycle nutrients back into the soil.
Why does sound travel faster through solids than through gases?✔✔Because particles in solids are closer together, allowing vibrations to move faster.
What is the law of conservation of energy?✔✔Energy cannot be created or destroyed, only transformed from one form to another.
How does a predator-prey relationship affect population sizes?✔✔Predators help control prey populations, which can affect the ecosystem balance. 2 / 4
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What is the difference between a compound and a mixture?✔✔A compound is chemically bonded, while a mixture is a physical combination of substances.
Why is the ozone layer important to life on Earth?✔✔It absorbs harmful ultraviolet radiation from the sun.
What causes the phases of the moon?✔✔The changing positions of the moon, Earth, and sun cause different amounts of the moon to be illuminated.
How do renewable energy sources differ from nonrenewable sources?✔✔Renewable sources can be replenished naturally, nonrenewable sources are finite.
What is an ecosystem?✔✔A community of living organisms interacting with their physical environment.
Why is biodiversity important in an ecosystem? 3 / 4
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✔✔It helps maintain stability and resilience against environmental changes.
What happens to the speed of a wave as it moves from deep water to shallow water?✔✔It slows down due to the change in depth affecting wave properties.
How do human activities impact climate change?✔✔By increasing greenhouse gas emissions that trap heat in the atmosphere.
What is the primary function of roots in a plant?✔✔To absorb water and nutrients from the soil and anchor the plant.
Why do metals conduct electricity?✔✔Because they have free electrons that allow electric current to flow easily.
How does photosynthesis benefit both plants and animals?✔✔Plants produce oxygen and food, which animals need to survive.
What is the difference between speed and velocity?
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