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Sewage drained into water bodies kill fishes because

1. excessive carbon dioxide is added to water
2. it gives off a bad smell
3. it removes the food eaten by fish
4. it increases competition with fishes for dissolved oxygen

Correct answer: it increases competition with fishes for dissolved oxygen

Solution

Sewage increases the organic matter in water, leading to microbial activity that depletes dissolved oxygen, creating competition for oxygen and suffocating fishes.

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