Classify the phylum Vertebrata into their further groups by giving two characteristics of each.

(N/A) $(i)$ Pisces: They have an exoskeleton of scales,an endoskeleton of bone/cartilage,and they breathe through gills.
$(ii)$ Amphibia: They possess gills in the larval stage and lungs in most adults; they have slimy,glandular skin.
$(iii)$ Reptilia: They have an exoskeleton of scales and are cold-blooded animals that lay eggs outside water.
$(iv)$ Aves: They have an exoskeleton of feathers,and their forelimbs are modified into wings for flight.
$(v)$ Mammalia: They have an exoskeleton of hair,possess external ears (pinnae),and are mostly viviparous (giving birth to young ones).