An ecosystem is a group of animals, plants and microorganisms that live together. The group of each type of living thing is called a community, and the place that they live is called a habitat.

Wetlands, rivers, lakes, and coastal estuaries are all aquatic ecosystems—critical elements of Earth’s dynamic processes and essential to human economies and health. Wetlands connect land and ...

All organisms in an ecosystem depend on each other. Food chains show the flow of energy from one organism to another. Changes to food webs All organisms in a food web depend upon each other and ...