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We do not clean ponds or lakes, but an a...

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why ?

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We do not clean ponds or lakes but an aquarium needs to be cleaned. An aquarium is an artificial ecosystem and it does not have enough population of decomposers to decompose waste materials produced by aquatic animals. Ponds or lakes are natural ecosystems that have plenty of producers, consumers and decomposers.
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We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why ?

(a) Natural water bodies are not regularly cleaned whereas an aquarium needs regular cleaning. Why ? (b) What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.

Why do you need to clean an aquarium periodically while ponds do not need to be cleaned?

The flora and fauna in lakes or ponds are