29. An element has two isotopes of masses of 10.012937 and 11.009305. The first isotope has a percent abundance of 19.8000%. Calculate the atomic mass of the element.

po-215 i got it right on the quiz

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.