Asolution contains one or more of the following ions: ag+, ca2+, and co2+. lithium bromide is added to the solution and no precipitate forms. an excess of lithium sulfate is then added to the solution and a precipitate forms. the precipitate is filtered off and lithium phosphate is added to the remaining solution, producing a precipitate.

1. Ag+ precipitates. 2. Ca2+ precipitates. 3. Co2+ precipitates.

Explanation:

First AgBr is formed which is practically insoluble in water. CaBr2 and CoBr2 are soluble.

Then precipitates CaSO4. CoSO4 is soluble.

And then precipitates Co2(PO4)3 which is insoluble.

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.