• Most reptiles reproduce sexually and have internal fertilization.
  • Males have one or two penises that pass sperm from their cloaca to a female.
  • Fertilization occurs within the cloaca, and fertilized eggs leave the female’s body.
  • In a minority of species, the eggs are retained inside the female's body until they hatch.
  • The shell, membranes, and other structures of an amniotic egg protect and nourish the embryo.
  • They keep the embryo moist and safe while it grows and develops.
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