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MCAT Question A Day - 5/11/13 - Answer!

Which of the following is not representative of the vertebrate body plan?

A.  Open circulatory system
B.  Coelom
C.  Two sets of paired appendages
D.  Separate sexes

The correct answer is (A). All vertebrates have a closed circulatory system in which the blood flows continuously through the heart and blood vessels, without bathing the tissues directly.