Process 1 is glycolysis - breaking down of glucose into pyruvate.
Process 2 is fermentation - generating energy without using oxygen
Process 3 is citric acid cycle - building up a high energy reduced NADH AND FADH2.
Process 4 is oxidative phosphorylation - building ATP using the high energy reduced molecules.
Note that only the reduced form (i.e. NAD+ and FAD) are electron acceptors. NADH and FADH2 are electron donors.
Water
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