Ecosystem
Stable, though not necessarily permanent, community of plants that have developed interrelationships with each other and with native wildlife to form a distinct, self-sustaining system.
Examples
A few examples of ecosystems are tallgrass prairie, boreal forest, estuary, and oak savannah. Though ecosystems are a useful concept, in real life a "pure" ecosystem is unusual; more common are areas in which several ecosystems overlap to various degrees.
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