Experiment 1: A zinc rod is immersed in a solution of magnesium(II) sulfate. Experiment 2: A zinc rod is immersed in a solution of copper(II) sulfate. In Experiment 1. no visible change was observed, while in Experiment 2, a brown solid settles to the bottom of the container
Explain the observations from BOTH experiments.

true

hope that

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

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.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.