The atmospheric pressure is the pressure exerted by the air on us. The force exerted by the air is related to the density of air. The atmospheric pressure of a gas decreases with an increase in altitude. At higher altitudes, the less dense air has a low concentration of oxygen. Thus at heights, the living bodies have a low concentration of oxygen in blood and tissue. At high altitude, the partial pressure of the oxygen is less than the ground level. Therefore, the low concentration of oxygen in the blood and tissue of people living at high altitudes is due to low atmospheric pressure. SOLUTION
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