Answer:
super cala fragilistic expiladocious
Explanation:
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The food chain is a system in which food is connected with the ecosystem. Ex:composers, producers, decomposers,etc.
The answer is D. NADH to NAD+
When no oxygen is present, anaerobic respiration occurs.It is the only way to produce ATP in this condition.NAD+ is necessary because it is converted into NADH and at the same time ADP is converted to ATP in the reaction of pyruvate synthesis from glucose.Therefore, NADH must be converted to NAD+ in order to have NAD+ always present in the cell.