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(i) Phylum : A phylum is group of related classes having some common features, e.g., protozoa.
(ii) Class : A class is group of related orders, for e.g., order Rodentia, Lagomorpha and Carnivora all having hair and milk glands are placed in class mammalia.
(iii) Family : A family is a group of related genera. The genus Felis of cats and the genus Panthera of lion, tiger and leopard are placed in the family Felidal.
(iv) Order : An order is a group of related families. The family Felidae of cats and the ┬╗family Coridal of dogs are assigned to the order carnivora. Cats and dogs have large canine teeth and are flesh-eaters.
(v) Genus : A genus is a group of species alike in the broad features of their organization but different in detail. As per the rules of binomial nomenclatures, a species can not be named without assigning it to a genus.