Biology

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

More Questions from Biology
Which of these is a deep-sea creature?
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Which one of these activities are a part of a plant's life cycle?
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What layer of the skin is just below the surface?
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What is the cell where a virus reproduces called?
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Which of these creatures is a one-celled organism?
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Which of these mammals lays eggs?
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Which of these animals has its shelter on its back?
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Pregnancy in humans lasts how many days?
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