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There has been an increase in the number...

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.

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(a) Classes of vertebrates with two-chambered heart: Cyclostomata (sea lamprey), Chondrichthyes (cartilage fishes) and Osteichthyes (bony fishes). (b) Classes of vertebrates of three-chembered heart: Amphibian (e.g. frog) and Reptilia (e.g. lizards and snakes). (c ) Classes of vertabrates and with four-chambered heart: Aves (e.g. Crow, Pigeon) and Mammalia (e.g. Man).
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