There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-chambered heart.
Two chambered heart: Chondricthyes and Osteicthyes. They contain one auricle and one ventricle; sinus venosus and conus arteriosus are present.
Three chambered heart: Amphibia and Reptilia. They contain two auricles and one ventricle.
Four chambered heart: Aves and Mammalia. They contain two auricles and two ventricles.
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