Biology

What forms the outer boundary of a cell and controls material moving in and out of the cell?

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What adaptation allows an organism to look like another in order to survive?
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Which of these animals is extinct?
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Which of the following is the purpose of cactus spines?
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What grows from an acorn?
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Which of the following organs is not used during digestion?
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What nutrient do girls need more of than boys when they are growing?
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What body system is the human heart part of?
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Which vitamin enhances the absorption of calcium from foods?
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