Of all of the following organisms,which has a true circulatory system?

Name: Of all of the following organisms,which has a true circulatory system?
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Question

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Cnidarians,such as hydras,and flatworms,such as planarians,do not have a circulatory system.Some animals,such as pseudocoelomate invertebrates (i.e.roundworms),use the coelomic fluid of their body cavity for transport purposes,as do the coelomate echinoderms,such as sea stars.

Of All of the Following Organisms,which Has a True Circulatory