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Sewage treatment is done by which kind of microbes?
AAutotrophic cyanobacteria added to the sewage
BHeterotrophic microbes already in the sewage
CGenetically engineered viruses added to sewage
DSymbiotic mycorrhizal fungi added to sewage
Answer & Solution
Correct answer: B. Heterotrophic microbes already in the sewage
Treatment relies on heterotrophic microbes already present in the sewage.
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