Question

we do not clean ponds or lakes but an aquarium needs to be cleaned. why?

Answer 1

ponds and lakes are part of the nature which had occured naturally despite of humans. whereas aquarium is artificial created by humans so it has to be maintained properly that is it needs to be cleaned

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Answer 2

it's has a simple reason I.e lakes and ponds are occurred naturally but aquarium is made by human so it is a reson


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