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Unformatted text preview: Identify a class within phylum mollusca that possesses an open circulatory system and a class within phylum mollusca that possesses a closed circulatory system. What are the distinctions between open and closed circulatory systems? (3pts) Answer: Class Bivalvia has an open circulatory system. Animals with open circulatory systems have no capillaries. Class Cephalopoda has a closed circulatory system. In closed circulatory systems the blood travels from the heart to the capillary beds and drains back to the heart through the veins....
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- Spring '10