A) light
B) micro-organisms
C) aquatic plants
D) fishes
Correct Answer: B
Solution :
Domestic sewage consists of human faeces, urine and dirty used-up water in house. It contains large number of bacteria and viruses. Sewage contains high phosphate and sulphate components, which induce the high growth of micro-organisms. Due to which \[{{O}_{2}}\] level is decreased in that water body which results in the death of fishes.
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