True coelom appeared first in the course of evolution in

Question

True coelom appeared first in the course of evolution in (A) Aschelminthes (B) Chordata (C) Echinodermata (D) Annelida

Tardigrade Admin · Accepted Answer

True coelom is lined by peritonium and is formed by splitting of mesoderm called schizocoelom. True coelom firstly appeared in Annelida.

Q. True coelom appeared first in the course of evolution in