The characteristic feature of phyllum porifera is pores on body.
In cnidarians, there is only one cavity which serves as digestive as well as body cavity whivh is called gastrovascular cavity or enteron.
The characteristic feature of platyhelmithes is their parasitic mode of life.
The characteristic feature of phyllum echinodermata is "spines on body."
In cnidarians, there is only one cavity which serves as digestive as well as body cavity whivh is called gastrovascular cavity or enteron.