What will be the total number of molecules of nadh, fadh2, and gtp that are synthesized if the citric acid cycle repeats 9 times?

Each turn of citric cycle produces one GTP along with one FADH2 molecule and three NADH molecules.

hence, 9 turn of citric cycle produces 9 GTP along with 9 FADH2 molecule and 27 NADH molecules

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.