Describe the role of the catalytic triad in chymotrypsin. In your answer you must state which amino acid residues are involved and what each residue does to facilitate catalysis. Which residue acts as the nucleophile required for covalent catalysis

i'm assuming that the correct answer is indeed the first one/ "a"..

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.