At high altitudes, the oxygen content of the air may be a third of that at sea level.
As a person climbs a mountain, their body gradually adjusts to the high altitude.
What is increased during this period of adjustment?
1 )
the concentration of haemoglobin in the red blood cells
2 )
the oxygen-carrying capacity of the haemoglobin
the number of red blood cells per $m{m^3}$ of blood
4 )
the rate at which haemoglobin releases oxygen to the tissues
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