Explain how animals in Vertebrata are classified into further subgroups.

Explanation

The major characteristics used to classify animals in vertebrata are-1 . The king exosheleton or endoskeleton, 2. The king of respiratory organs,3. The method of reproduction and givin birth to yound ones. On the bais of above mentioned characters the vetebrata is divided into following classes:
(i) Exoskeleton of scales , Endskeloton of cartilage or bones , Breating through gill.....PISCES (Fishes)
(ii) Breathing through gill only in larva , Skin slimy....AMPHIBA
(iii) Exoskeletone of scales , Laying eggs outside the water ....REPTILIA.
(iv) Exoskeleton fo fethers , Lay eggs, fight possible ..... ...... AVES (Birds)
(v) Exoskeleton of hairs , External ears , Give birth to youn ones .....MAMMALIA