In the troposphere carbon monoxide and nitrogen dioxide undergo the following reaction: NO2(g) CO(g): NO(g) CO2(g) Experimentally, the rate law for the reaction is second order in NO2(g), and NO3(g) has been identified as an intermediate in this reaction. Construct a reaction mechanism that is consistent with these experimental observations.

c (diamond),

sio2 (quartz)

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.