"What kind of circulatory system do mollusks have? Closed circulatory system Open circulatory system Both A and B None of the above"
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: Understand Mollusk Circulatory Systems

Mollusks are a diverse group of invertebrate animals that include creatures like snails, slugs, clams, octopuses, and squid. Their circulatory system is characterized by a unique feature that distinguishes them from many other animal groups.

Final Answer

The key point is that most mollusks have an open circulatory system where blood is not completely contained within blood vessels, but flows freely in the body cavity.