are a group of vertebrate animals constituting the class Mammalia
characterized by the presence of mammary glands which in females produce milk for feeding their young, give birth to young ones, warm blooded, a neocortex, fur or hair, and three middle ear bones.
examples are: human beings, cat, dogs, monkeys, cow etc.
MONOTREMES
are a group of highly specialised egg-laying predatory mammals
the only living monotreme species are the platypus and echidnas
are typified by structural differences in their brains, jaws, digestive tract, reproductive tract, and other body parts compared to the more common mammalian types.
MARSUPIALS
a mammal that raises its newborn offspring inside an external pouch at the front or underside of their bodies.
All extant marsupials are endemic to Australasia and the Americas.
They give live birth, but they do not have long gestation times like placental mammals.
Well-known marsupials include kangaroos, wallabies, koalas, opossums, wombats, Tasmanian devils, and the extinct thylacine.
Answers & Comments
ANSWER:
MAMMALS
MONOTREMES
MARSUPIALS