when domestic sewage mixes with water ,A. small animals such as rats will die after drinking river waterB. the increased micorobial activity relases micronutrients such as ironC. the increased microbial actvity uses up dissolved oxygenD. the river water is still suitable for drinking as impuphorus are only about 0.1%

when domestic sewage mixes with water ,A. small animals such as rats w

1.	when domestic sewage mixes with water ,A. small animals such as rats will die after drinking river waterB. the increased micorobial activity relases micronutrients such as ironC. the increased microbial actvity uses up dissolved oxygenD. the river water is still suitable for drinking as impuphorus are only about 0.1%
Answer» Correct Answer - C

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