(i)  Amphibia
(a) Habitat: They live in freshwater and marine water. They can also live on land.
(b) External Features: Body is divided into head and trunk. Tail may be present in some. Skin is moist and has no scales. Eyes have eyelids. Tympanum represents
the ear.
(ii) Reptilia
(a) Habitat: They are primarily terrestrial animals. However, some are found in  aquatic habitat as well. But they cannot breathe under water. Limbs are in two pairs. 
(b) External Features: Skin is dry and covered with cornified scales. Tympanum represents the ear. Limbs (if present) are in two pairs.