The claisen condensation converts 2 molecules of an ester into a β-keto ester. the reaction starts with the ester in an alkoxide/alcohol solution and is worked up with acid to form the neutral β-keto ester product. show the curved-arrow mechanism for the claisen condensation of ethyl ethanoate treated with ethoxide ion.

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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.