Biology

What is most of the oxygen that enters the human body taken in through?

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What type of worm is an earthworm?
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Where is the mandible found?
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How many main kingdoms are there in the living world?
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What is a main reason that many species are becoming endangered?
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What carries the code for making proteins from the nucleus to the cytoplasm?
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What science word means "to group"?
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How many inches in length is the typical human esophagus?
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What natural biological defense system protects the body from disease and fights off germs?
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