____ do not exist by themselves in their own isolated environment, they interact with other species forming ____ . These communities interact with each other and the ____ they live in, forming ecosystems. An ____ is a relatively self-contained community of interacting organisms and the environment they live in, and interact with. There is a ____ within an ecosystem and nutrients within it are recycled. There are both living (____) components and non-living (____) components within an ecosystem. No ecosystem is completely ____ as organisms from one ecosystem are often ____ to organisms from another. Ecosystems are ____. This means that the characteristics of ecosystems and their populations vary over time. Ecosystems often experience disruptions, or changes. These changes can happen in either ____ or ____ parts of an ecosystem.

Ecosystems

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