Mammalian,bird,and crocodile hearts have four chambers with two separate atria and ventricles to ensure ________ different circuits for blood flow.

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Mammalian, bird, and crocodile hearts have four chambers to ensure two different circuits for blood flow: the systemic circuit, which circulates blood through the body, and the pulmonary circuit, which circulates blood through the lungs.

Mammalian,bird,and Crocodile Hearts Have Four Chambers with Two Separate Atria