What causes death of fish in water bodies polluted by sewage?

Foul smell

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Pathogens

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Clogging of gills by silt

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Decrease in DO

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Solution

The correct option is D Decrease in DO
When water is contaminated by sewage, the amount of nutrients in it increases. This increase in nutrients in water encourages the growth of algae and weed in the water. Algae and weed consume DO in water. The decrease in DO causes fish to die.

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