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OpenStudy (anonymous):
Explain the need for ventilation systems in a multicellular organism
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OpenStudy (anonymous):
A ventilation system is needed in order to obtain oxygen for living organisms and to get rid of carbon dioxide. Surface diffusion utilized by many smaller organisms is not sufficient in supplying the oxygen needs of the body. http://wiki.answers.com/Q/Why_do_multi-cellular_organisms_need_a_ventilation_system#ixzz1b4rAMxCS
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