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plesiosaur reproduction

I was looking up at our plesiosaur the other day, and for the first time
(strange how obvious things elude our thoughts) I wondered how they
reproduced. I can't imagine an plesiosaur supporting
its weight on land to lay eggs like a sea turtle, but couldn't think of an
alternate solution. Did they have live births? What about the other
marine reptiles like Mosasaurs?

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Sherry Michael                         "The scientific point of view is
Academy of Natural                      that every phenomenon is in
Sciences, Philadelphia                  nature and part of it" 
Dino Docent/teacher                                   -Albert Kroeber