Re: Can a reptile be birthed by a mammal

Well the simple answer would be no, probably not -- mainly because most mammals do not produce 
a shell around the developing embryo.  The presence of a shell means that the developing embryo 
obtains its nutrients from stored materials within the egg (the yolk, etc.).  Most mammals feed 
the developing embryo via the placenta (although marsupials are alittle different).  

But if you wanted to stretch a point, you could propose to use a monotreme
(see http://www.ucmp.berkeley.edu/mammal/monotreme.html ) like the platypus or the echidna.  
These mammals lay eggs, like reptiles (and dinosaurs) and so it is conceivable (although just barely) 
that they could be re-engineered serve as a surrogate dino-mom --  whether they could be modified 
sufficiently to produce an appropriate egg is rather less clear. Good luck on your grade!