generally we do not clean natural Ponds or lakes but an aquarium needs periodic cleaning why
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4
Answer:
Because they want clean water for their survival. In dirty water they can not live. The clean water is like there home.
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1
Answer:
because you want water for living because water contain many oxygen so it is need to clean the aquarium we can keep the pond because we can get the outside but you have seen in the aquarium there is sperm to give oxygen so it is the answer hope its help you
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