Biology

Which of the following is a signal that you are hungry?

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What was the dominant invertebrate of Mesozoic seas?
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What is another name for the portion of Earth that sustains life?
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What element are the bases of DNA mostly comprised of?
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How many joints does an ant have in each leg?
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What is made by white blood cells to help fight off infection?
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Rainfall made sufficiently acidic by atmospheric pollution is called what?
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Which of these body parts takes in food?
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Which of these animals does not typically hibernate?
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