7. C2H4O2 is what? vinegar

Yes its vinegar

Explanation:

Actually is the formula for acetic acid which is found in vinegar.

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.

0.88m hope i am correct : )