Which of the following is true for covalent bonding? A.
electrons are shared

B.
electrons are transferred

C.
particles are always positively charged

D.
oxidation numbers are always negative

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2

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.