Fishes die due to sewage pollution because:

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(C) Sewage contains high amounts of organic matter. When this organic matter is discharged into water bodies,microorganisms (bacteria) decompose it. T

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It increases the competition for oxygen among fishes

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(C) Sewage contains high amounts of organic matter. When this organic matter is discharged into water bodies,microorganisms (bacteria) decompose it. This decomposition process consumes a large amount of dissolved oxygen $(DO)$ from the water. As a result,the level of dissolved oxygen decreases significantly,leading to the death of fishes due to oxygen depletion.

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