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.
11. C
12. A
13. B
16 and 17. Dont know sorry
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No because they help to come up with tests that a person could run and then when they don't work just change the hypothesize to something that fits the tests or change the tests.