Each of these circles represents an animal group. Which one of these options has animal groups which can be depicted by this diagram? I II III IV i Animals with three germ layers Animals having bilateral symmetry Animals with no coelom Animals with a chitinous exoskeleton. ii Animals with radial symmetry Animals with calcareous ossicles Animals with rasping organs called a radula Animals with three pairs of legs iii

Step-by-step solution

In this diagram I includes II which includes III which includes IV. Thus group IV should be a sub group of group III which should be a sub group of II which should be a sub group of I. In option i, Animals with three germ layers (Triploblastic) are present in all phyla from Platyhelminthes to Chordata. Animals having bilateral symmetry are present in all phyla from Platyhelminthes to Chordata except Echinodermata. Animals with no coelom (triploblastic + bilateral symmetry) are present in Phylum Platyheminthes. But