Biology

What body system is the human heart part of?

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What are the single thread-like cells on the root epidermis called?
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What nutrient do girls need more of than boys when they are growing?
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Which of these is part of an onion plant?
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What kind of stem would an oak tree have?
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What vertebrates are cold-blooded and have dry scaly skin?
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Where would you find two maxilla bones and two nasal bones?
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What is a very young plant called?
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In what part of the body is hair growth the fastest?
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