What are the group names of the following categories of animals ?
(a) Animals with a backbone..............................
(b) Animals with a hairy skin..............................
(c) Animals with three pairs of legs .......................
(d) Animals with feathers...............................
(a) Animals with a backbone: Vertebrata
(b) Animals with a hairy skin: Mammalia
(c ) Animals with three pairs of legs: Insecta
(d) Animals with feathers: Aves