Answer:
Well some people don't get enough sunlight during winter and some don't drink enough orange juice. Others might have a disorder where their body doesn't produce enough vitamin d
Explanation:
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Answer:
The smallest bronchioles end in tiny air sacs, called alveoli. They inflate when a person inhales and deflate when a person exhales. During gas exchange oxygen moves from the lungs to the bloodstream.
Explanation:
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