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Do we need to clean lakes or ponds in th...

Do we need to clean lakes or ponds in the same manner? Why or why not ?

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Yes, because sometimes excretory wastes accelerate the growth of algae. The lake or pond gets covered with algal growth. Some toxic substances are released and dissolved `O_2` in water body will be depleted. This will lead to death of all aquatic life and such ecosystem may destructed.
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