Air Entering the Lungs Has

Air entering the lungs has

A) a higher concentration of carbon dioxide than the air in an alveolus.
B) a higher concentration of both carbon dioxide and oxygen than an alveolus.
C) a higher concentration of oxygen and a lower concentration of carbon dioxide than in an alveolus.
D) a lower concentration of oxygen and carbon dioxide equal to the concentrations in an alveolus.

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