What developed along with internal organ systems in animals, to allow these organs to expand and contract without disrupting the activity of neighboring organs?

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    a skeletal system
    a lymphatic system
    a coelom
    a circulatory system
    nervous tissue
asked May 19, 2013 in Biology by anonymous

1 Answer

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a coelom
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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