The evolution of viviparity and placentation revisited.

  title={The evolution of viviparity and placentation revisited.},
  author={Carl P. Qualls and Robin M Andrews and Thomas R. Mathies},
  journal={Journal of theoretical biology},
  volume={185 1},
Most studies on the evolution of viviparity in squamate reptiles have focused on one or more of the following questions: (1) what selective force(s) are involved in the transition from oviparity to viviparity? (2) how does this transition occur (i.e., what changes are involved)? and (3) how and when does placentation evolve? In answer to the first of these questions, most studies have implicated cold climates (at high latitudes or high elevations) as the primary selective force involved [see… CONTINUE READING

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