question: What is a therian mammal in which the embryo is born at an early, immature stage?
distractor3: carnivore
distractor1: rodent
distractor2: bat
correct_answer: a marsupial
support: Marsupials have a different way of reproducing that reduces the mother’s risks. A marsupial is a therian mammal in which the embryo is born at an early, immature stage. The embryo completes its development outside the mother’s body in a pouch on her belly. Only a minority of therian mammals are marsupials. They live mainly in Australia. Examples of marsupials are pictured in Figure below .