Asnwer? A certain atom has 22 protons and 19 electrons. this atom loses an electron.
the net of the aton is now ___.(4+,1+,0,1-,4-)
if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be___.​(3+,2+,0,2-,3-)

it is the most commonly accepted one

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.