[Campbell Biology P.1089] Based on general biological knowledge and information presented, wh... | Practice Question

Based on general biological knowledge and information presented, which of the following features is most uniquely associated with typical mammalian reproduction among animal groups?

  • A: A female uterus
  • B: A male vas deferens
  • C: Extended internal development of the embryo
  • D: Parental care of newborns

Explanation

While internal development and parental care exist in other animal groups, the 'extended internal development' of the embryo, particularly involving a placenta for prolonged gestation and nutrient exchange, is a defining characteristic most uniquely associated with placental mammals Eutheria . This allows for a much more advanced state of development at birth compared to other animals with internal development.