Red and green beetles from a forest migrate to grasslands. in the new environment, green beetles are able to protect themselves better from predators through camouflage. which change in the population will most likely happen over time

The population of red beetles will more likely to decrease over time, meanwhile the green beetles may increase. This is because in a new environment, red beetles are more likely to be found by predators, and green ones can camouflage themselves, so the red ones will be eaten, while the green ones stay unbothered so that the rate will even increase.