In nuclear fission this subatomic particle is used to begin the chain reaction

A subatomic particle is something smaller than an atom. These are further broken up into elementary and composite subatomic particles.

Electrons are elementary, whereas protons and neutrons are composite and can still be further broken down.

Explanation:

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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.