Domestic sewage mainly contains $A$ wastes which are readily decomposed with the help of $B$. Here $A$ and $B$ refer to:
- A$A-$inorganic; $B-$bacteria
- B$A-$biodegradable; $B-$decomposers
- C$A-$chemical; $B-$microorganisms
- D$A-$synthetic; $B-$bacteria
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