Identify the mismatched event from the following structures.

Biological equilibrium is found among the

Consider the following four statements $(A-D)$ and select the correct option stating which ones are true $(T)$ and which ones are false $(F)$.
Statements:
$(A)$ Vertical distribution of different species occupying different levels in a community is called stratification.
$(B)$ Net primary productivity minus respiration losses is the gross primary productivity.
$(C)$ Rate of biomass production is called decomposition.
$(D)$ Annual net primary productivity of oceans is $55$ billion tons.

Which one of the following is not a functional unit of an ecosystem?

Which among the following is not a functional unit of the ecosystem?

The maximum evolution of oxygen is by which of the following producers of organic matter?