what is Sehwag ? explain why it is harmful to discharge untreated saibag into rivers or seas ? explain.
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Sewage is a liquid containing wastes from households, industrial and agricultural activities discharged into water.
It is harmful to discharge untreated sewage into rivers or seas because it can pollute the whole water source.
Sewage contains harmful substances and disease-causing organisms.
Therefore, it is dangerous to release untreated sewage in water.
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