Biology

What is made by white blood cells to help fight off infection?

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Which species is correctly paired with its type?
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What is endocrinology?
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What vertebrates are cold-blooded and have dry scaly skin?
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Most adults have how many canine teeth?
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Which insect is known for its sting?
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What is the name of the tube that carries blood to the heart?
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How many bones are in the human body?
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What adjective means belonging to or associated with a flower?
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