Answers

2014-08-20T21:18:10+05:30
When we go up to higher altitudes from lower altitudes the oxygen content in the air decreases.so when we go to mountains the oxygen content is not as much as in the plains.so its more difficult to breathe on the mountain than on the plains.
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2014-08-20T21:24:09+05:30
Yes this is because When we go high Above the altitude the air become denser and we find it difficult to breathe.As at high altitude there is deficiency of oxygen.
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