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Type of circulatory system in molluscs

Name the type of circulatory system in molluscs? How can it be contrasted to respiratory system of the annelids?

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Molluscs with exception of cephalopods encompass an open circulatory system, that is, blood circulates in vessels, from heart, but it also fills cavities open or lacunas. In the annelids circulatory system is closed, that is, blood circulates only in blood vessels.

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