Which class of Mollusca is characterized by a closed circulatory system and high intelligence?
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Correct answer: Cephalopoda
Cephalopods (octopuses, squids, cuttlefish, nautiluses) are the most neurologically advanced molluscs. They are the only members of the phylum with a closed circulatory system, which supports the high oxygen demand of their active, predatory lifestyle and complex nervous systems.
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