The maximum population size that an environment can support.

The process by which organisms develop traits that increase their survival chances.

Organisms compete within the same species for limited resources.

The struggle between organisms of different species for the same resources.

A trait or behavior developed to increase an organism's chances of reproducing.

A change in the genetic makeup of a population over time.

A relationship where one organism hunts and consumes another.

A lack of enough resources, such as food or water, to meet the needs of all organisms.