Ecological System
Ecological System : The most complex level of organization is the ecological system. An ecosystem includes the plant, animal and microbial communities in an area, together with the non-living physical environment that supports them. Ecosystems have physically defined boundaries, but they are also dynamic: their boundaries and constituents change over time. They can import and export materials and energy. Thus, an ecological system can interact with and influence other ecosystems. They can also vary widely in size (e.g., ponds, lakes, oceans)
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