People living at sea level have around 5 ; mi | vedclass

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(B) At high altitudes,the atmospheric oxygen level is low. To compensate for the reduced partial pressure of oxygen,the body increases the production

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Atmospheric oxygen level is less and,hence more $RBCs$ are needed to absorb the required amount of oxygen to survive

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(B) At high altitudes,the atmospheric oxygen level is low. To compensate for the reduced partial pressure of oxygen,the body increases the production of $RBCs$ to ensure that sufficient oxygen is transported to the tissues. Therefore,people living at high altitudes have a higher count of $RBCs$ (around $8 \; million/mm^3$) compared to those living at sea level (around $5 \; million/mm^3$).

People living at sea level have around $5 \; million$ $RBCs$ per cubic millimetre of their blood,whereas those living at an altitude of $5400 \; m$ have around $8 \; million$. This is because at high altitude:

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