An ecosystem is a location where living things such as plants and animals live with each other in a community among non-living things such as rocks and water. An ecosystem is part of a larger area known as a biome. Examples of ecosystems include deserts and fields.
The living and non-living things within an ecosystem interact with each other and keep the ecosystem working in harmony. For example, in a hot desert such as the Sonoran Desert in Arizona, a few bodies of water support fish, turtles and snakes. In fields, flowers offer nectar for bees to turn into honey, and bees, in turn, help to pollinate the flowers so that they can produce seeds. When an ecosystem changes over time, life within it must find a way to adapt or risk dying out completely. Plants cannot move when the environment changes, but some species of animals may migrate to another ecosystem in order to survive.
An ecosystem may change due to natural causes, such as an extended drought. These changes may happen either quickly or over long periods of time. People may also bring about changes to an ecosystem in a short amount of time, sometimes upsetting the fine balance present therein.