If large quantities of domestic sewage is continuously emptied into a small stream, it leads to

depletion of oxygen content in stream water

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depletion of nutrients in the stream water

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enrichment of oxygen content in stream water

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increase in the total amount of life in the stream water.

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Solution

The correct option is A depletion of oxygen content in stream water
If large quantities of domestic sewage are continuously emptied into a small stream, it leads to depletion of oxygen content in stream water as microbes that develop to degrade the organic matter shall consume the oxygen and reduces its amount.
So the correct option is 'depletion of oxygen content in stream water'

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