A) of its bad smell.
B) it replaces food material of fishes.
C) it increases oxygen competition among fishes.
D) \[C{{O}_{2}}\] is mixed in large amounts in water.
Correct Answer: C
Solution :
[c] 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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