$\begin{array}{1 1}(a)\;\text{Secondary succession begins in areas where natural biotic communities have been destroyed}\\(b)\;\text{Hydrarch succession takes place in wetter areas}\\(c)\;\text{Succession is the series of change of vegetation in a given area}\\(d)\;\text{Succession does not lead to any change in predators and decomposers in an area}\end{array} $
