Explain how population sizes in nature are related? hel me

In nature, population growth must eventually slow, and population size ceases to increase. ... The population size at which growth stops is generally called the carrying capacity (K), which is the number of individuals of a particular population that the environment can support.

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.