Red blood cells lack mitochondria. as a result, atp production is solely through

The right answer is glycolysis (anaerobic respiration).

The red blood cell is a cell that does not require much energy to live, it is content with anaerobic glycolysis. This may seem paradoxical, because the red blood cell is rich in oxygen due to its transport by hemoglobin, but the red blood cells saves energy consumption so as not to draw oxygen and transport the maximum of it.

The red blood cell must produce energy for 2 main purposes:

Maintain the integrity of the membrane,.

Maintain Hb in its active form.

the speed increase from w to x due to increased gravity force

the speed decreases from x to y due to decrease in gravity

i think that d. wind is the answer.   i missed the question when i answered a. currents.