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Which kind of circulatory system do molluscs contain

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

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

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