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a
of its bad smell
b
it replaces food material of fishes
c
it increases oxygen competition among fishes
d
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.