Exercise requires the use of oxygen to produce energy.

It certainly does. If you mean this to be a true false question, then the answer is huge yes.

People with deficiencies in Red Blood Cells will certainly tell you that they are listless and can do very little work because they are not getting enough oxygen going through their bodies. They are not lazy, nor incompetent, because every activity is daunting because they just cannot do the work.

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this would and i think the answer is d

you would need to check her bp before and after her activity.