A student trying to calculate the density of a ball. She already knows the mass but she needs to determine the volume as well witch of the following formulas can be used to calculate the volume of the ball

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.