NEET PG DENTAL EXAM

Detailed explanation-1: -Marsupials give birth to a tiny, immature embryo. The embryo then continues to grow and develop in a pouch on the mother’s belly. Marsupial development is less risky for the mother. However, the embryo is fragile, so it may be less likely to survive than the fetus of a placental mammal.

Detailed explanation-2: -Marsupials probably evolved in North America, expanded into South America and the Pacific rim of Asia. During this period of migration the North American marsupials became extinct, followed by extinctions in Europe during the Miocene epoch of the Tertiary period.