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No, they have open circulatory system.

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16y ago

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Do octopus snails oysters and sponges all have a closed circulatory system?

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In cephalopods like octopuses, the circulatory system is closed, with blood contained in vessels. Bivalves like clams have an open circulatory system where blood is pumped into a hemocoel. Gastropods, such as snails, have a mix of closed and open circulatory systems, with a heart that pumps blood through vessels but also into spaces around organs.


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