Organisms like earthworms which have a coelom,would have which type of circulatory system?

Name: Organisms like earthworms which have a coelom,would have which type of circulatory system?
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An earthworm has a series of contractile vessels that are often called hearts,and their activity keeps the blood moving.The earthworm has no specialized boundary,such as lungs,for gas exchange with the external environment.Gas exchange takes place across the body wall,which must always remain moist for this purpose.

Organisms Like Earthworms Which Have a Coelom,would Have Which Type