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Ravi, who lived at sea level, had around...

Ravi, who lived at sea level, had around 5 million RBCs per cubic mm of his blood. Later , when he lived at an altitude of 18000 ft, showed around 8 million RBCs per cubic mm of blood. This is an adaption because

A

he had pollution free air to breathe

B

at high altitude, he ate more nutritive food

C

at high altitude, `O_(2)` level is less hence more RBCs were required to take more oxygen

D

at high altitude, there is more UV radiation which enhance RBCs production

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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.

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.

In man , the number of R.B.C. per cubic mm of blood is (a) 1 to 3 millions (b) 5 to 5.4 millions (c) Less than one milliion but more than 50 thousand (d) Less than 50 thousand