Describes how likely an element is to form bonds with other elements. Reactivity
Flamability
Dissolving
Melting

im not exactly sure but i think its b!

i wish i could but this one is weird give me abc and i can solve it.

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.