The main reason for which we are dependent on air is our .
-
A.
excretion
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B.
osmoregulation
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C.
respiration
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D.
digestion
Correct Answer:
C. respiration
Explanation:
Human life is fundamentally reliant on air primarily because of respiration. This vital biological process involves inhaling oxygen from the atmosphere, which cells then utilize to break down nutrients and generate the energy necessary for survival, while simultaneously expelling carbon dioxide as a waste product. Unlike digestion or excretion, which involve processing solids and liquids, respiration requires a continuous supply of atmospheric gases to maintain metabolic functions.
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