Frogs, Salamanders, Tortoise and Crocodiles are seen in both water and land. But they are classified into two different classes ofthe phylum Vertebrata. Evaluate this classification comparing salient features of each class.

Match the items in columns B and C with A. OR Features of different phyla/class are given below. Identify the phylum/ class and give examples of each group. a) Body is covered by scales, heart is three or four chambered. b) They are exclusively marine, commonly called sea walnuts and shows bioluminescence. c) Body is divided into proboscis, collar and trunk: They have open circulatory system and presence of proboscis gland.