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When domestic sewage mixes with river wa...

When domestic sewage mixes with river water

A

samll amimals like rats will die after drinking river water

B

the increased microbial activity releases micro-nutrients 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%.

Text Solution

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The correct Answer is:
C
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