Populations depend on and with each other.

Populations depend on and compete with each other.

Explanation:

The competition between organisms and species is an interaction where both parties are harmed either by an external factor such as territory, water, food ...

Studies show that competition regulates demographic rates between species in an ecosystem.

And according to evolutionary theory, this competition for an external or internal factor is important for natural selection.

Consequently, competition requires species to adapt to change to survive or they will be in danger of disappearing.