Which of the following best defines over-the-counter medications?
a. medications that require a written order from a doctor
b. drugs that can be purchased at a store without a prescription
c. drugs that can be taken for mind-altering effects that have no medical purpose
d. substances that cause a change in a person's physical or psychological state

3 hours because it is a decent distance.

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.