All vertebrates have closed circulatory systems, meaning that the blood never travels outside of a system of veins, arteries and capillaries.
Closed hydrovascular for echinoderms, open haemolymphatic for arthropods. ^^
Amphibians have closed circulatory system Closed
closed circulatory system (double circulatory system)
Yes it has a closed circulatory system
closed circulatory system
Sea otters have a closed circulatory system.
Platypuses have a closed circulatory system.
closed circulatory system.
Brown bear have a close circulation system
closed circulatory system
Frogs have a double circulatory system, which means that circulation goes from the heart to the lungs (where it becomes oxygenated), then returns to the heart, then is pumped to the rest of the body (which takes the oxygen), and then returns to the heart. They have a closed circulatory system, which means that the blood travels through the body in vessels. Frogs have a three-chambered heart.
Worms have a closed circulatory system because they inherited it from their ancestors.