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Treatment of waste-water is done by the...

Treatment of waste-water is done by the

A

Photoautotrophic microbes , naturally present in sewage

B

Chemoautotrophic microbes naturally present in sewage

C

heterotrophic microbes naturally present in sewage

D

Heterotrophic microbes incoculated in the sewage from outside only .

Text Solution

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The correct Answer is:
C
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