Which of the following is always true about a endothermic reaction? A. The energy of the reactants is greater than the energy of the products B. The energy of the products is greater than the energy of the reactants C. Energy is always released as the chemical reaction proceeds D. All reactants are always compounds never elements

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.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.