American Forests, March 1st, 1995
The urban ecosystem is a complex regime that can be broken down into feature-specific layers. People are the dominant factor in the ecosystem, and human activity is the single biggest influence on it.
Everybody and everything lives in one community or another. Your community may be in a city, the suburbs, or in a rural area, and it may be big or small. Most of us think of community in terms of social conditions, but it also has a biological meaning. A community is a place where plants and animals share the same environment; it is both a social and an ecological unit.
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