• Therian mammals are divided into two groups: placental mammals and marsupial mammals.
  • Each group has a somewhat different reproductive strategy.
  • The female reproductive system of all therian mammals is similar to that of humans.
  • The uterus is a pouch-like, muscular organ.
  • Muscular contractions of the uterus push the offspring out during birth.
  • The vagina is a tubular passageway through which the embryo or fetus leaves the mother’s body.
  • The placenta allows the exchange of gases, nutrients, and other substances between the fetus and mother.
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