Question

a population of snakes that eat small rodents enters a new habitat. in the new habitat, there are many species of rodents, and their populations are high because there are few natural predators. what will most likely be the effect on the genetic variation of the snake population?
genetic variation will increase because of a selective pressure.
genetic variation will increase because of a new habitat and food source.
genetic variation will decrease because of a selective pressure.
genetic variation will decrease because of a new habitat and food source.

Explanation:

In a new habitat with many rodent species (a new food source), snakes have more opportunities for different feeding behaviors and interactions. This leads to more genetic diversity as different traits related to hunting different rodent species can be favored and passed on. Selective pressure here is likely to be less restricting (since rodent populations are high with few predators), so it's the new habitat and food source that drive the increase in genetic variation.

Answer:

Genetic variation will increase because of a new habitat and food source.