Which of the following is responsible for the beginning of the detritus food chain?

Identify the correct sequence of the process of decomposition.

Humus is found in

In decomposition,humus is further degraded by some microbes and the release of inorganic nutrients occurs by the process known as...

The food chain in which microbes split energy-rich compounds of the producer community is:

Given below are two statements:
Statement $I:$
Decomposition is a process in which the detritus is degraded into simpler substances by microbes.
Statement $II:$
Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements,choose the correct answer from the options given below: