question_answer

                  What are the differences between animals belonging to the aves group and those in the mammalian group?   

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