Which of the following are examples of marsupials?

• A. Kangaroo, Opossum
• B. Bat, Whale
• C. Mouse, Human
• D. Platypus, Echidna

Answer: (A)

Marsupials are mammals that give birth to very immature offspring that finish developing in a pouch, where they continue to grow and nurse. This pouch protects and nourishes the newborn as it matures. Kangaroos and opossums show this pattern clearly: their young are born small and then crawl into a pouch on the mother’s belly to finish development.

Bats and whales are placental mammals, meaning their embryos develop inside the uterus with a placenta supplying nutrients for a longer gestation period. Mice and humans are also placental mammals with extended in-utero development. Platypus and echidna are monotremes, egg-laying relatives, not marsupials.

So, the combinations that fit the marsupial pattern are kangaroo and opossum.