Compost manure is formed from

Study the following flow chart of biogas production and select the correct option for $A, B$ and $C$.
Stage $III$: $C$
Stage $II$: Organic acids $\xrightarrow{B}$ $C$
Stage $I$: Soluble compounds or monomers $\xrightarrow{A}$ Organic acids
(Note: The flow chart shows: Proteins,Fats,Cellulose,Hemicellulose $\rightarrow$ Soluble compounds or monomers $\xrightarrow{A}$ Organic acids $\xrightarrow{B}$ $C$)

Biogas is a mixture of gases produced by the activity of microbes. The type of gas produced depends on:

During sewage treatment,the biogas produced includes:

Which microorganisms are responsible for the production of gas in the biogas plant shown in the figure?

Which gas is primarily produced in biogas plants?