Placental Viviparity What is it? a) Placental viviparity is a form of viviparity where embryos develop inside the mother's body and are nourished by a placenta. b) Placental viviparity is a form of oviparity where eggs are laid outside the mother's body and then hatch into larvae. c) Placental viviparity is a form of viviparity where embryos develop outside the mother's body and are nourished by yolk sacs. d) Placental viviparity is a form of reproduction where embryos develop inside the mother's body and hatch from eggs.