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When domestic sewage mixes with river wa...

When domestic sewage mixes with river water

A

The increased microbial activity releases micronutrients such as iron

B

The increased microbial activity uses up dissolved oxygen

C

The river water is still suitable for drinking as impurities are only about 0.1 %

D

Small animals such as rats will die after drinking river water

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The correct Answer is:
B
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