Which formulas represent ionic compounds and which represent covalent compounds? Covalent compound:
CsF
Na o
CHN
PCI,
Cao
CHO
NH
WO
lonic compound:
Cs
CdBr,
N
SOS

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.