What is a solution?
100 points
it is a mixture that contains both colloids and suspensions inside of it.

it is a mixture in which particles can be seen and easily separated.

it is a mixture that contains small, undissolved particles that do not settle out.

it is a mixture that appears uniform throughout and whose particles cannot easily be separated.

1. Heterogeneous

2. Suspension

3. Collide

4. A homogeneous mixture

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.