Several species of warblers live together in a forest habitat. Each species feeds in separate zones of spruce trees, consumes different combinations of insects, and nests at somewhat different times. These birds are able to minimize direct competition for limiting resources through .

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

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