Physical, or nonliving, factor that shapes an ecosystem

A living part of an ecosystem

The natural home or environment of an animal, plant, or other organism.

A group of individuals that belong to the same species and live in the same area.

All the different populations that live together in an area.

A measurement of the number of organisms per given unit of land.

A way a species interacts with abiotic and biotic factors to obtain food, find shelter, and fulfill other needs.

A common demand by two or more organisms upon a limited supply of a resource; for example, food, water, light, space, mates, nesting sites. It may be intraspecific or interspecific.

An interaction in which one organism captures and feeds on another organism

A close relationship between two species that involves an exchange of food or energy.

A relationship between two species in which both species benefit

A relationship between two organisms of different species where one benefits and the other is neither harmed nor benefited

A relationship between two organisms of different species where one benefits and the other is harmed

An organism that can make its own food.

An organism that obtains energy by feeding on other organisms

series of steps in an ecosystem in which organisms transfer energy by eating and being eaten

Is a model of energy transfer that can show how the food chain in a community are interconnected.