Cl- and Cl+ are of each other. The first one has protons and neutrons. The second one has protons and neutrons.

it's filtration, but this is an assumption so my apologies if i got this

girl imma just put my comment here because i need a couple point okurrttt

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.