The half-life of isotope XX is 2.0 years. How many years would it take for a 7.0 mg sample of XX to decay and have only 0.4375 mg of it remain?

it is a good conductor

explanation:

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.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;