HELP WITH THIS QUESTION PLEASE!!!!?

At higher altitude, because atmospheric pressure is lower than at lower altitudes, there is less O2 in the air you breathe. Extended time at altitude produces a stimulates an adaptive, compensatory response to that altitude-dependent hypoxia in which the production of red blood cells (the vehicles for O2 transport) is increased. It takes roughly two weeks for that to occur.

A major part of the acclimatization is dependent on a physiological response to hypoxia in the kidney--production and release of a hormone called erythropoietin (EPO) is turned on. EPO circulates through the blood, and it stimulates red blood cell production in its target organ, the bone marrow.

It is not your Blood carrying capacity at high altitude that affects you it is the amount of oxygen in the air that is the problem, there is not enough to provide the body with its requirements.