In a laboratory investigation, magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. this reaction is represented by the unbalanced equation below.
mg(s) + hcl(aq) ==> h2(g) + mgcl2(aq)
state, in terms of the relative activity of elements, why this reaction is spontaneous.

i look it up online and i'll tell you

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.