Which kind of circulatory system do molluscs have, Biology

Q. Which kind of circulatory system do molluscs have? How can it be compared to the respiratory system of annelids?

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

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