Humans cannot survive long at altitudes greater than 6000 m because ________.

A. the partial pressure of O2 becomes less than half that at sea level
B. the diaphragm cannot be contracted enough to produce a full breath
C. alveoli become compressed at the lower atmospheric pressures
D. there is much more CO2 in the atmosphere at the higher altitudes than at sea level


Answer: A

Biology & Microbiology

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