A) drinking river water
B) the increased microbial activity releases micronutrients such as iron
C) the increased microbial activity uses up dissolved oxygen
D) the river water is still suitable for drinking as impurities are only about 0.1%
Correct Answer: C
Solution :
Domestic sewage consists a lot of degradable organic matter. When this sewage is released into river water, it will result in an increase of Biochemical Oxygen Demand CBOD) and decrease in the amount of dissolved oxygen due to decomposing activity of microbes.
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