Why is an open circulatory system less efficient than a closed circulatory system?
A) Metabolic wastes cannot be removed from tissues in an open circulatory system.
B) There is no heart to pump the blood in an open circulatory system.
C) It is more difficult to quickly deliver O2 to specific tissues when needed with an open circulatory system.
D) Open circulatory systems lack respiratory pigments that bind to oxygen.
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