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What structure surrounds the cell and regulates materials that enter and leave the cell?

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A student puts two identical plants in the same type and amount of soil. She gives them the same amount of water. She puts one of these plants near a sunny window and the other in a dark room. This experiment tests how the plants respond to

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Many processes on Earth occur at or near tectonic plate boundaries. Which geological events are most common along tectonic plate boundaries?

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What happens when oil is placed in water?