In the course of evolution, true coelom appeared for the first time in…..
A. Chordata
B. Annelida
C. Aschelminthes
D. Echinodermata
Answer:A
In the course of evolution, true coelom appeared for the first time in…..
A. Chordata B. Annelida C. Aschelminthes D. Echinodermata