DOUBLE CIRCULATION

https://docs.google.com/presentation/d/1gdZZfXJbxMzIABdTE5VDtz7b9pqnCMmg/edit?usp=drive_link&ouid=112418425102942225803&rtpof=true&sd=true 



In animals, there are two types of circulatory systems: open circulatory system and closed circulatory system. The majority of mammals, including humans, use a double circulatory system. 

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