Biology
NULL
Medium
Question
Circulatory system is open type in all of the following except: ___________?
A
Arthropoda
B
Gastropoda
C
Pelecypoda
D
Cephalopoda
✓ Official correct answer
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A
Arthropoda
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B
Gastropoda
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C
Pelecypoda
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D
Cephalopoda
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Explanation
Cephalopods, such as octopuses and squids, are unique among mollusks and most invertebrates in having a closed circulatory system, unlike the open circulatory systems found in arthropods and most other mollusks.