Question

Unlike eutherians, both monotremes and marsupials ________.

1) lack nipples
2) have some embryonic development outside the mother's uterus
3) lay eggs
4) are found in Australia and Africa
5) include only insectivores and herbivores

Answer 1

Both monotremes and marsupials have some embryonic development outside the mother's uterus; monotremes lay eggs, while marsupials carry their young in a pouch.

Step-by-step explanation:

Unlike eutherians (placental mammals), both monotremes and marsupials have some embryonic development outside the mother's uterus. Monotremes are unique among mammals as they lay eggs, with species such as the platypus and echidnas found predominantly in Australia and New Guinea. Marsupials, such as kangaroos and koalas, give birth to underdeveloped embryos which then develop in the pouch. Although monotremes lay eggs similar to reptiles, they secrete milk from mammary glands for the young. Marsupials carry their immature young in a pouch where they continue to grow and develop.