Answers

2016-04-27T21:32:41+05:30
An ecosystem is a complex set of relationships among the living resources,habitats and residents of an area.
Ecological imbalence is causes by any natural calamities or human activities.
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2016-04-27T22:20:59+05:30
Ecosystem is a community of biotic and abiotic components in the environment.

two reasons of ecological imbalance are
killing of animals
cutting down of trees
lot of pollution
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