1)Why do clouds usually form high in the air instead of near Earth's surface? a) High in the atmosphere is less dense
b) High in the atmosphere contains less oxygen
c) High in the atmosphere is usually cooler
d) High in the atmosphere has less air pressure

yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes

explanation:

i'm assuming that the correct answer is indeed the first one/ "a"..

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.