A 30mL of mixture of two bases is titrated with 0.1 N HC1. If the mixture requires 25 mL of acid for reach to end point of phenolphthalein indicator and
5mL of HCl for reach to end point of methyl orange indicator. Identify the bases
and calculate the normality of each base.

"the periodic table is arranged in order of atomic number."

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.