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Mountain climbers feel weak and show sym...

Mountain climbers feel weak and show symptoms of anoxia at high altitude because :

A

At high altitudes, the partial pressure of oxygen is less than that at the ground level.

B

At high altitudes, the partial pressure of oxygen is more than that at the ground level.

C

At high altitudes, the partial pressure of oxygen is same as that at the ground level.

D

At high altitudes, the partial pressure of oxygen is zero

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