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Question About Ventilation In A Fish

  1. Sep 29, 2004 #1
    The flow of water and ventilation system in fish is 1 way, where as in mamals the flow of gases is in 2 ways. why is this???
  2. jcsd
  3. Sep 29, 2004 #2
    gills are open ended.. lungs have only one point of entry/exit !
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