1. State three differences between a single circulatory system and a double circulatory system
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Single circulatory System
1. Single circulation blood flows through the heart only once during one cycle of passage through the body.
2. Only venous blood passes through the heart.
3. Occurs only in fishes.
Double Circulatory system
1. Blood flows twice through the heart during one cycle of passage through the body.
2. Mixed or oxygenated or venous blood passes through the heart.
3. Occurs in all other vertebrates other than fishes.
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