Which change would most likely cause a decrease in the number of squirrels living in and area

Migration of squirrels.

Explanation:

Migration of squirrels can cause decrease in population in an area.

Squirrels migrate or move for one place to another which can be as a result of drought, food shortage or overpopulation.

Squirrels tend to migrate from an area to another in search of food for living. They also move when there is drought to get water and when their population in an area much, the migrate to get another space.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.