Fishes die by sewage because

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of its bad smell

it replaces food material of fishes

it increases oxygen competition among fishes

CO2 is mixed in large amounts in water

answer is C.

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Detailed Solution

Sewage is a waste material (such as human urine and faeces) that is carried away from homes and other buildings in a system of pipes. Fishes die by sewage due to increase oxygen competition among them which leads to suffocation from low levels of dissolved oxygen in the water.

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