A model that shows all possible trophic pathways in a community.

Any organism that produces it's own food at the first step of a food chain or a food web.

The movement of chemical potential energy, in the form of food, that gets passed from one trophic level to the next.

A model that shows a single trophic pathway in a community.

Any microorganism that breaks down dead plant or animal tissue to obtain energy.

A principle that states that only 10% of the energy passed from one trophic level to another will be converted into plant or animal tissue (biomass) and provide a food source for consumers.

The matter stored in an ecosystem as animal tissue (bone, muscle, etc.) or plant tissue (leaves ,stems, bark, etc.)

A measurement for the number of individuals in an environment or habitat.

The simultaneous demand by two or more organisms for limited environmental resources.

The maximum population of a particular organism that a habitat or environment can sustain.

Anything that can impact an individual or population of individuals. Includes water, habitat, and food.

A series of processes that show how carbon (matter) and the related energy are moved between living and nonliving parts of an ecosystem in a cyclic manner.

The regions/areas of the Earth that living organisms occupy (land, air, and water).

The envelope/layer of gases that surround Earth.

The solid portion of the earth including rocks and sediments of the crust and mantle. Also known as the lithosphere.

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