A) Microbes
B) Fertilisers
C) Antibiotics
D) Antiseptics
Correct Answer: A
Solution :
[a] Sewage is a waste material (like human urine and faeces) that is carried away from homes and other buildings in a system of pipes. Sewage treatment is the process of removing contaminants from wastewater which is done by heterotrophic microbes naturally present in sewage.
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