Biology

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

More Questions from Biology
Which of the following does NOT grow on a tree?
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Which of these is a renewable energy and fuel source?
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How many chromosomes does a typical human body cell have?
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Which of these animals might compete for the same food source as a red-tailed hawk?
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Which of these does a wolf communicate through?
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How many bones are in each finger, except the thumb, of a human hand?
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What element are the bases of DNA mostly comprised of?
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Who devised a simple test to determine the health of newborns?
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