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People living at sea level have around 5...

People living at sea level have around `5` million RBC per cubic millimetre of their blood whereas those living at an altitude of `5400` metres have around `8` million. This is because at high altitude.

A

people get pollution free air to breth and more oxygen is availabel

B

atmospheric `O_(2)` level is less and hence more rvcs are needed to absorb the required amount of `O_(2)` to sruvivie

C

there is ore uv radiation which enhanes r bc production

D

people eat more nutritive food there fore more rbcs are formed

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The correct Answer is:
B
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