The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as :

The species of plants that plays a vital role in controlling the relative abundance of other species in a community is called _________.

Identify the correct statements :

A. Detrivores perform fragmentation.

B. The humus is further degraded by some microbes during mineralization.

C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.

D. The detritus food chain begins with living organisms.

E. Earthworms break down detritus into smaller particles by a process called catabolism.

Choose the correct answer from the options given below :

In the equation GPP $$-$$ R = NPP

GPP is Gross Primary Productivity

NPP is Net Primary Productivity

R here is __________.