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They have a closed circulatory system.
they have a closed circulatory sytsem:]yur welcome..... Sorry, this answer is very incorrect. A closed circulatory system means that the blood is contained within blood vessels, which the heart is able to pump/move through the tissues for very efficient gas exchange. Sponges DO NOT have this. In fact sponges do not even technically have a circulatory system at all, gas exchange is achieved by diffusion from the outer cells. So this means that sponges do not have an open or a closed circulatory system, because they don't have one at all.
No oysters do not have a closed circulatory system. They have something known as a open circulatory system. They are similar to that of fish. They have something similar to that of the gills in fish so that they are able to function in the aquatic environment. The closed circulatory systems, are usually in the terrestrial animals such as mammals, birds etc.
Amphibians have closed circulatory system Closed
Squid's have complex, closed circulatory systems. They have three hearts; two of the hearts pump blood to the gills. Once the blood has circulated through the gills it is then directed to the main heart to be pumped to the rest of the body.
closed circulatory system (double circulatory system)
Yes it has a closed circulatory system
closed circulatory system
closed circulatory system
Example of closed Circulatory animals is worms
Platypuses have a closed circulatory system.
squids have closed closed circulatory systems