The evolution of the cardiovascular system in vertebrates involved several important changes. Which one of the following represents the order of a major change that occurred?

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    3-chambered to a 2-chambered and then a 4-chambered heart
    an open to a closed circulatory system
    4-chambered to a 3-chambered and then a 2-chambered heart
    a closed to an open circulatory system

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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an open to a closed circulatory system
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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