# The depicted food web is not complete. Mainly because

$\begin{array}{1 1}(a)\;\text{The no of producers is less than the no of consumers }\\(b)\;\text{There are no decomposers}\\(c)\;\text{Only secondary consumers are showing with multiple prey species}\\(d)\;\text{The source of energy is assumed as sun}\end{array}$

The depicted food web is not complete. Mainly because there are no decomposers.
Hence (b) is the correct answer.