# The entire sequence of communities that successively change in a given area are called

$\begin{array}{1 1}(a)\;\text{Seres}\\(b)\;\text{Seral communities}\\(c)\;\text{Ecological communities}\\(d)\;\text{Phylogenetic community}\end{array}$

The entire sequence of communities that successively change in a given area are called seres.
Hence (a) is the correct answer.