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The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.

1. ATP
2. H2O
3. FAD+ or FADH2
4. NADH

Correct answer: NADH

Solution

NADH is produced in glycolysis and the citric acid cycle, then carries electrons to the electron transport chain. In aerobic respiration diagrams, it is the key product linking the first two pathways to the third.

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