___________ mammals develop within the mothers body for a longer period of time and the young are relatively mature at birth..

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      Marsupial
      Modern
      Placental
      Retro
      Pleistocene
asked Mar 12, 2013 in Earth Science by anonymous
    

1 Answer

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Placental
answered Mar 15, 2013 by h20 ~Top Expert~ (6,320 points)

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