CSS :: Ecology and General Silviculture
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An ecosystem is:
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[A]. |
A functional unit of biotic and abiotic components which have an energy source | [B]. |
Either a part of land surface, a body of fresh water or the open oceans
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[C]. |
A functional unit consisting of sunlight, air water and minerals | [D]. |
A system consisting of an energy source, producers and consumers |
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