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A closed circulatory system is present in a. arthropods b. sponges c. flatworms d. mollusks e. annelids

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e. annelids
a closed circulatory system means the movement of blood in one direction in the same systemic route. the blood will not be drained into the body cavities. Annelids which includes earthworms will have the closed circulatory system.
sponges and flatworms do not have a true circulatory system.
arthropods and mollusks have an open circulatory systems.

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