Biology

How many stages of sleep are there?

More Questions from Biology
What is the inability to digest the predominant sugar of milk?
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How many bones are in each finger, except the thumb, of a human hand?
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Rice and wheat are both members of what family of plants?
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Which of these does a wolf communicate through?
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Which one of the following animals hatches from an egg outside the mother's body?
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What kind of tree loses all its leaves during a dormant period like winter?
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Which of these body parts takes in food?
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What are the two kinds of blood cells?
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