Question

A man was brought up at sea level while his brother spent all his life at an altitude of 10000 feet. The latter will have
a)more active bone marrow
b)lower blood pressure
c)less subdermal fat
d)more active sweat glands

Answer 1

Answer is option a, more active bone marrow.

At high altitudes, the level of oxygen in air is low and people living in low oxygen conditions produce a high level of erythropoietin hormone from the kidneys.
Erythropoietin acts on the bone marrow and increases the production of red blood cells.