Biology

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

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How many pairs of ribs are in a typical human body?
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Natural pearls are found in what sea creature?
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What is a name for the place where an animal lives?
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Which of following words means "to die"?
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What are some plant leaves connected to the stem with?
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Which of these is a renewable energy and fuel source?
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Which group has the greatest number of endangered organisms?
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Which of these is a kingdom in the classification of living things?
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