Which of the following can decompose complex organic matter into simpler forms?

The process by which earthworms break down detritus into smaller particles is called ......

In decomposition,detritivores break down detritus into smaller particles. This process is called......

Which of the following is not a step of decomposition?

The word $detritus$ includes:

Identify the processes $P, Q,$ and $R$ in the following descriptions:
$I -$ The process of breaking down detritus into smaller particles $- P$
$II -$ Bacterial and fungal enzymes degrade detritus into simpler inorganic substances $- Q$
$III -$ Water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts $- R$
Select the correct option for $P, Q,$ and $R$.