Fish die in water bodies polluted by sewage due to:

large number of mosquitoes

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increase in the amount of dissolved oxygen

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decrease in the amount of dissolved oxygen in water

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None of these

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Solution

The correct option is A decrease in the amount of dissolved oxygen in water
Sewage contains biodegradable waste which is degraded by bacteria with the help of dissolved oxygen. This results in a decrease in dissolved oxygen.
Since aquatic life depends on the dissolved oxygen. Fish die in water bodies polluted by sewage due to a decrease in dissolved oxygen.

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