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Q.

The breathing difficulties occur as we go up on the mountains because


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a

The amount of air increases

b

The level of oxygen reduces

c

Harmful radiations increases

d

The level of oxygen increases 

answer is B.

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Detailed Solution

The breathing difficulties occur as we go up on the mountains because the level of oxygen reduces.
Air is present everywhere on the Earth as a thin layer. As we go up the mountains, the amount of air present reduces, corresponding to that, oxygen level is very low. This reduced level of oxygen creates breathing problems. The mountaineers have to carry oxygen cylinders with them as at higher altitudes, the oxygen level is very low.
 
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