we do not clean natural ponds or lakes but we do not need to lean acqarium regularly. why it is so explain?
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pond are the example of a natural ecosystem whereas an aquarium is a example of an artificial ecosystem .Ponds do not need to be cleaned but aquarium needs to be cleaned because an aquarium does not contain soil and decomposing bacteria which help in degrading complex . Organic substance into simple inorganic substance .But ponds or lakes have this ability of self purification and there fore these do. not need to be cleaned ....
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deep240:
ofcourse
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They are natural ecosystems
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