In what order do a hawk, grass and rabbit form a food chain in a meadow?

In a lake, phytoplankton grow abundant in

To eat and be eaten relationship is called as

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

Frog, that feeds on insects, is a