The main reason for which we are dependent on air is our _____.
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A.
digestion
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B.
osmoregulation
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C.
respiration
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D.
excretion
Correct Answer:
C. respiration
Explanation:
Air is essential for human survival primarily because it provides the oxygen required for respiration. During this biological process, cells utilize oxygen to break down nutrients and generate the energy needed to maintain vital bodily functions. While digestion, osmoregulation, and excretion are also critical physiological processes, they cannot occur or sustain life without the energy produced through the respiratory exchange of gases.
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