What volume of a 0.6 M KBr solution is needed to provide 30.5 g of KBr?

0.472 L

Explanation:

Molarity is the moles of solute over the liters of solvent.  KBr is the solute.  

To find the liters of solvent, first convert grams of KBr to moles of KBr.  You then divide moles of KBr by the molarity.  Your answer should be 0.427 L.

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.