Practice question

Crocodilians including crocodiles, alligators and gharials diverge markedly from other non-avian reptiles by possession of fully divided four-chambered heart having two atria and two ventricles complete interventricular septum eliminating mixing, converging functionally with avian and mammalian high-pressure systemic and low-pressure pulmonary separation supporting active predatory lifestyle, prolonged diving and partial endothermy. Specialized foramen of Panizza at arterial base allows shunting between aorta during submergence conserving oxygen. Lepidosaurs lizards snakes and chelonians retain three-chambered heart with partial septation allowing intracardiac shunting less efficient.