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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

1)people get pollution free air to breath and more oxygen is available

B

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

C

3)there is more uv radiation which enhances RBC production

D

4)people eat more nutritive food there fore more rbcs are formed

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The correct Answer is:
B
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