Marsupials give birth to a tiny, immature The embryo then continues to grow and in a pouch on the mother's belly. Marsupial is less risky for the mother. However, the is fragile, so it may be less likely to survive than fetus of a placental mammal. of marsupials include small birth size, gestation period, the presence of pouches or skin folds used to protect offspring during development outside the uterus, unique anatomy, and the lack of a corpus in their brains. largest and most-varied assortment of marsupials— 200 species—is found in Australia, New Guinea, neighbouring islands, where they make up most of native mammals found there. They are not to montane grasslands. Hence statement I is and statement II is not correct.