Which of the following statements is true?
A) Arthropods have an open circulatory system, while annelids have a closed circulatory system.
B) Vertebrates have an open circulatory system, while annelids have a closed circulatory system.
C) Vertebrates have an open circulatory system, while arthropods have a closed circulatory system.
D) Annelids have an open circulatory system, while molluscs have a closed circulatory system.
Answer: A
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