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CGP EDU Academic Team
Published on: August 20, 2026
Birds and Mammals have :-
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Birds and mammals have four-chambered hearts. Their circulatory system is called the double circulatory system because blood passes through the heart twice:
Body 
Heart 
Lungs 
Heart 
Body
Birds and mammals have a closed type of circulation wherein the blood does not directly come in contact with the cells or tissues but instead flows in tubelike structures called the arteries, veins, and capillaries.
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