Classification of Multicellular Animals

The multicellular animals (Animalia) originated from the simpler protozoan protists. You know the simpler multicellular animals further evolved, giving rise to the diversity of the animal life which came to exist on the earth. In this you will learn the characteristic features of some of the phyla comprising this animal diversity namely, Porifera, Cnidaria, Ctenophora, Platyhelminthes, Nematoda, and Rotifera, and also study their further classification into classes.