Biology
What natural biological defense system protects the body from disease and fights off germs?
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In which fluid-filled cavity do organs develop in organisms such as earthworms?
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What is the fold of tissue that surrounds a mollusk's soft body?
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Which type of Japanese tree is small and grows in a pot?
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What element are the bases of DNA mostly comprised of?
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During which of the following biological phases does "crossing over" take place?
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What natural biological defense system protects the body from disease and fights off germs?
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What are squirrels thought to bury to store for a winter supply of food?
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