They lack mitochondria - mitochondria is where cellular aerobic respiration take place. Without it, a cell cannot do aerobic respiration.
It regenerates glucose from lactate generated anaerobically in red blood cells and muscle.
NADH did it, NADH is a strong electron donor.
NADPH did it.
I am always confused with this "reason" type of question. Unless someone is designing it and has a reason of doing so, there reason isn't a reason, it is just what nature did.
That's said, if we interpret the question is "What make "NADH transfer electrons to iron" a necessarily step", then it is a sensible question.
The answers are:
To regenerate NAD+ needed to drive glycolysis forward, and
To maintain hemoglobin-bound iron in its reduced (Fe2+) state.
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