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Unformatted text preview: ventricle is diverted, some to the pulmonary circuit , some to systemic circuit . The disadvantage of the three-chambered heart is the mixing of oxygenated and deoxygenated blood. Some reptiles have partial separation of the ventricle. Other reptiles, plus, all birds and mammals, have a four-chambered heart, with complete separation of both systemic and pulmonary circuits....
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