Question

match each mammal group with its correct description of development.
instructions
monotremes
lay eggs; after hatching from eggs, young drink from a milk - secreting pore on the female
marsupials
live - bearing, but newborn young are tiny and very immature and crawl into a pouch, where they suckle milk and continue developing
placental
live - bearing; young develop inside uterus of female and are nourished by a placenta

Explanation:

Monotremes are the only mammals that lay eggs. After hatching, the young obtain milk from a milk - secreting pore on the female. Marsupials are live - bearing, but their newborns are tiny and immature, crawling into a pouch to continue development. Placental mammals are live - bearing, with the young developing inside the female's uterus and nourished by a placenta.

Answer:

monotremes - lay eggs; after hatching from eggs, young drink from a milk - secreting pore on the female.
marsupials - live - bearing, but newborn young are tiny and very immature and crawl into a pouch, where they suckle milk and continue developing.
placental - live - bearing; young develop inside uterus of female and are nourished by a placenta.