A latex weather balloon is filled with hydrogen gas and then released. It climbs high into the air and continues to an altitude of 40 km, where it suddenly stops
climbing. Describe what happens inside the balloon from the time it is released
until the time it stops çlimbing. What will eventually happen to the balloon?

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.