In an animal, a muscle cell requires more energy than other cells. Because of this, you would expect to find more of which type of organelles in muscle cells than in other cells?
O Vacuoles
O Chloroplast
O Cell walls
O Mitochondria

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.