Answers

2016-02-20T10:44:54+05:30
It is so because as we go upper from earth's surface the gravitational force decreases and air also becomes thin , so our head is very higher then our feets touches the ground , only this must difference of height also makes huge differences

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2016-02-20T11:15:35+05:30
There are 2 reasons:
1) distance b/t heart and feet is greater than dis. b/t heart and brain
2) the blood from the feet has to be pushed back against the force of gravitation
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