During aerobic respiration, H2O is formed. Where does the oxygen atom for the formation of the water come from?

During aerobic respiration, H2O is formed. Where does the oxygen atom for the formation of the water come from? 




A) carbon dioxide (CO2)
B) glucose (C6H12O6)
C) molecular oxygen (O2)
D) pyruvate (C3H3O3-)
E) lactate (C3H5O3-)






Answer: C


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