If you buy an item on sale, you know you got a good deal.
true or false?

It's true because I'm doing an exam about this question

false because they could cheat you out your money or it won't be worth it

Explanation:

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.