Which factors would help a person to adjust from living at a low altitude to living at a high altitude?
1) formation of fewer red blood cells
2) an increase in the oxygen-carrying capacity of the blood
3) an increase in the output of blood by the heart
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 and 3 only
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