Define the following terms:
$(i)$ Productivity
$(ii)$ Decomposition

(N/A) $(i)$ Productivity: The rate of biomass production per unit area over a time period is called productivity. It is expressed in terms of $g^{-2} yr^{-1}$ or $kcal m^{-2} yr^{-1}$.
$(ii)$ Decomposition: This is the process by which decomposers break down complex organic matter (detritus) into simpler inorganic substances like carbon dioxide,water,and nutrients.