For the acids, use the formula pH = -log{H+}. (Because HCI has 1 H+ ions per formula unit, {H+} equals the molarity.) For water, use what you know about the pH of neutral solutions. For the bases, examine and extend the pattern.

the answer is b & c i believe : )

10 years is the answer

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.