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Which causes death of fishes in water bodies polluted by sewage?

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Which causes death of fishes in water bodies polluted by sewage?

(a) Foul smell

(b) Pathogens

(c) Clogging of gills by silt

(d) Decrease in D.O.

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Correct answer: (d) Decrease in D.O.

Explanation:

Decrease in D.O causes death of fish.

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