Sewage drained into water bodies kills fishes because:
Correct answer: C. It increases the competition with fishes for dissolved oxygen
- A. It gives off a bad small
- B. It removes the food eaten by fishes
- C. It increases the competition with fishes for dissolved oxygen
- D. Excessive CO2 is added to water
Explanation
Organic sewage is decomposed by microorganisms that consume dissolved oxygen, increasing the biological oxygen demand of the water. Fish then die from oxygen deficiency, not because sewage directly removes their food.
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