Which one of the following characteristics is not shared by jelly fish and comb jelly? 

Comb plates occur only in ctenophores (e.g., comb jelly) but not in cnidarians (e.g., jelly fish). 

Both cnidarians and ctenophores are diploblastic with tissue level of organisation. 

Their body wall has an outer epidermis and an inner gastrodermis with a gelatinous mesoglea between the two. 

Digestion is both extracellular and intracellular.