Biology

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

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What is the anatomical name for the thighbone?
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What vertebrates are cold-blooded and have dry scaly skin?
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What characteristic could show that a bird might be ready to reproduce?
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What nutrient group gives long-lasting energy?
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What is the liquid in your mouth that helps soften food called?
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In addition to mucus, what helps your nose filter out germs and dirt?
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What fluid-filled sac surrounds the human embryo?
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What are the gaps between nerve cells called?
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