A chemistry teacher performs a type of titration where sample interacts with a suitable substance to give an equivalent substance to the unknown sample that is calibrated with a standard solution. This is what type of titration?

i just learnt this recently but i need to look through my notes again

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.