(i) Invertebrate: Those animals which do not have backbone are called invertebrates. Protozoa, Metazoa, Porifera, Cnidaria, Platyhelminthes, Nematoda, Mollusca, Annelida, Arthropoda I Echinodermata are invertebrates. For example – snail (Pila globosa), fly (Musca domestica), earthworm (Metaphire posthuma) etc.
(ii) Vertebrate: All the animals which have backbone in their body are called vertebrates. Animals in the order Chordata are vertebrates. For example, lion (Panthera leo), tiger (Panthera tigris), cow (Naja naja), cow (Bos indicus) etc.