How does an open circulatory system differ from a closed one?
A. An open circulatory system drains into the mantle cavity whereas a closed circulatory system drains into the hemolymph.
B. An open circulatory system opens into arteries and is drained by veins whereas in a closed one it is just the reverse.
C. An open circulatory system opens into the heart whereas the closed circulatory system does not.
D. The open circulatory system has a combination of blood vessels and large thin-walled sinuses whereas a closed circulatory system has only vessels.
E. A closed circulatory system is completely encased in the body cavity whereas the open one is not.
Answer: D
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