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Advantages of the open system. The closed circulatory system of some mollusks and all vertebrates and higher invertebrates is a much more efficient system. Internal Transport In The Cnidarian Aurelia Open And Closed While humans as well as other vertebrates have a closed cardiovascular system m…

August 21 2016 firas ahmed. Mixing of the blood in the heart s ventricle reduces the efficiency of oxygenation. Worms Have 5 Hearts But No One To Love Earthworms are invertebrates with a closed circulatory system in which blood is pumped by five pairs of hearts. Which invertebrate has 5 hearts …