when domestic sewage mixes with water ,A. Small animals like rats will die after drinking river water.B. The increased microbial activity releases micronutrients such as iron.C. The increased microbial activity uses up dissolved oxyen.D. The river water is still suitable for drinking as impurities are only about 0.1%.

when domestic sewage mixes with water ,A. Small animals like rats will

1.	when domestic sewage mixes with water ,A. Small animals like rats will die after drinking river water.B. The increased microbial activity releases micronutrients such as iron.C. The increased microbial activity uses up dissolved oxyen.D. The river water is still suitable for drinking as impurities are only about 0.1%.
Answer» Correct Answer - C

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