Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 32. g of octane is mixed with 67.2 g of oxygen. Calculate the minimum mass of octane that could be left over by the chemical reaction. Round your answer to significant digits.

there are two significant figures.

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.