In the carbon cycle,bacteria are essential as:

What is common to earthworm,mushroom,soil mites,and dung beetle in an ecosystem?

Which of the following acts as $''$nature's scavengers$''$?

Humus means......

The process by which humus is degraded by some microbes to release inorganic nutrients is known as

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 $R$.