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Those two evolutionary advances needed the development that is previous of fertilization. The deposition of sperm by the male into the female’s reproductive tract and the sperm’s subsequent penetration of the egg cell was necessary before the shelled egg could exist in other words.

In residing reptiles the deposition for the male’s semen ins > penis (such as turtles order Testudines and crocodiles order Crocodylia, or Crocodilia) or hemipenes (like in lizards and snakes order Squamata). Continue reading “The evolution of amniotic development as well as the shelled egg enabled vertebrates to be fully terrestrial”