Which of the following is an explanation that an evolutionary biologist would give to explain the loss of eyes in a species of fish that lives in dark caves?
1) The fish evolved to rely on other senses for survival in the dark environment.
2) The fish lost its eyes due to a genetic mutation.
3) The fish's eyes were no longer necessary for survival in the dark caves.
4) The fish's eyes were damaged or became non-functional over time.