why circulation of blood in aquatic vertebrates differs from that in Terrestrial vertebrates?
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Obtaining oxygen entirely from air, instead of from water, involved drastic changes in the circulatory system. Land vertebrates use their lungs to exchange carbon dioxide for oxygen from the air.
Examples of animal circulatory systems:
(a) Fish have the simplest circulatory systems of the vertebrates: blood flows unidirectionally from the two-chambered heart through the gills and then to the rest of the body.
(c) Reptiles also have two circulatory routes;
however, blood is only oxygenated through the lungs.
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