A group of one or more species living in a certain habitat.

A community of organisms interacting with their enviroment.

A group of living things that interact in an ecosystem.

An organism, like bacteria, that breaks down dead plant or animal matter and releases its nutrients back into the soil.

A plant or animal that gets its energy from other living things.

An animal that eats plants rather than other animals.

An animal that eats meat.

The complex network of food chains in an ecosystem.

An ordered arrangement of animals and plants in which each feeds on the one below it in the chain.

The place or natural conditions in which an organism lives.