Two students describe natural selection to their classmates. Student 1 describes that individuals are able to evolve to fit their changing environment and thus result in populations that are well adapted over time. Student 2 proposes that natural selection
occurs when selective pressures act on individuals but evolution affects whole populations. Which student should refine their
explanation of natural selection and why?

Student one should refine their answer because it implies that individuals can evolve within their own life. Evolution is a process that take thousands and even millions of years and will affect an entire population. One individual will not be able to evolve in a single lifetime.

Explanation:

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."