Answer:
Vertebrates
can be further classified into subgroups on the basis of simple or complex body
structures and their functions. For example, fishes have two chambered hearts,
amphibians have three-chambered hearts while birds and mammals have
four-chambered hearts to keep the oxygenated and deoxygenated blood separate.
The following characteristic features are considered for classifying
vertebrata into further subgroups-
Characteristics
Exoskeleton of scales, endoskeleton of bone/ cartilage,
breathing through gills
Gills in larva, lungs in most adults, slimy skin
Exoskeleton of scales laying eggs outside water
Exoskeleton of feathers, lay eggs outside water, flight
possible
Exoskeleton of hair, external ears, mostly giving birth
to young ones
Class
Pisces
Amphibia
Reptilia
Aves
Mammalia
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