Question

Guppies are small fish that live in South American rivers. They can have different- sized spots on their bodies. The river bottoms are covered in rocks. Guppies with spots that are the same size as the rocks on the bottom are harder for bigger fish to see and catch. The diagram below shows a population of guppies that live in a river. At time 1, the population had the same number of guppies with small and large spots. At time 2, after many generations, there were many more guppies with small spots and fewer guppies with large spots in the population. How did the environment change between time 1 and time 2? How did the population change? (1 point)

Responses You cannot tell how the environment changed. With each generation, more guppies passed on the gene for small spots to their offspring.

The rocks became smaller. Guppies with small spots are more likely to survive, so the guppies with large spots changed to have small spots.

The rocks became smaller. Guppies with small spots are more likely to survive, so both kinds of guppies passed on the gene for small spots to their offspring.

. The rocks became smaller. With each generation, more guppies with small spots survived long enough to pass on the gene for small spots to their offspring.

Answer 1

[AI-generated answer — Bot GPT 3.5]

The correct response is:

- The rocks became smaller. With each generation, more guppies with small spots survived long enough to pass on the gene for small spots to their offspring.

This change in the environment led to a change in the population, with more guppies having small spots to better blend in with the smaller rocks on the river bottom. This adaptation allowed them to be less visible to predators and have a higher chance of survival.