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Frogs have a three-chambered heart consisting of two atria and one ventricle, allowing partial mixing of oxygenated and deoxygenated blood.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Circulatory and Excretory System
Frogs have a double circulatory system, unlike fish, which have a single circulatory system.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Circulatory and Excretory System
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