Biology

How many stages of sleep are there?

More Questions from Biology
What is the outermost covering of trees and some plants called?
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What is the human body's largest organ?
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Which is the sheet-like muscle at the bottom of a human chest?
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What natural response would a human have to the cold?
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What gives red blood cells their color?
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What is any matter that is or once was living called?
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Which of these senses do you use to tell what color an object is?
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What part of the plant does most of the photosynthesis?
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