Soil.
food, water, and an appropriate environment are crucial to all organisms.
Black squirrels may increase in a certain area due to natural selection because of the ground below it being dark so the squirrels would adapt to the terrain, making them harder to see by predators.
EXAMPLE: if a light fur colored squirrel is on a dark terrain, an Owl or Large bird could easily see the color differentiation and notice that it is a small land organism (prey).
So the squirrels kin would evolve in the sense that they would have darker fur to match their inhabitance
Evolution is the theory of slow change during long time periods.
Answer:
Overharvesting
Explanation:
Too much harvest and planting causes the soil to wear down and be less useful.
