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Molluscs-circulatory system

State the type of circulatory system molluscs has? And compared it with the respiratory system of the annelids?

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Molluscs, (with exception of cephalopods), have open circulatory system, by this we means that the blood circulates within the vessels, from heart, but it also fills the cavities or open lacunas. In annelids, circulatory system is closed, which means that the blood circulates only inside the blood vessels.

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