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Q.

Why do human beings have difficulty breathing at high elevations?


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a

O2 makes up lower percentage there

b

The temperature is higher there

c

The barometric pressure is higher there

d

Pressure of O2 is lower there. 

answer is D.

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Detailed Solution

Human beings have difficulty breathing at high altitudes because the O2 pressure is lower there.
People have trouble breathing at high altitudes because the high air pressure drops sharply, while the O2 fraction remains unchanged up to 100 km. Therefore, O2 pressure decreases with altitude again and again.
 
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