No, not all mammals are placental. There are two other groups of mammals: the monotremes and the marsupials.Monotremes are egg-laying mammals, and marsupials are generally pouched mammals, although not all marsupials have fully developed pouches.
Not at all. Aquatic placental mammals include dolphins, whales and dugong.
Terrestrial placental mammals do have fur or hair. Marine placental mammals do not.
No. Primates are a group of placental mammals, but there are many placental mammals that are not primates.
placental mammals are the most famous mammals
Most mammals are placental...marsupial mammals and monotremes are not placental.
Prototheria is the subclass containing the egg-laying mammals (the echidna and platypus). Metatheria is the subclass that encompasses marsupials and a few other now-extinct mammals that were not placental. The other subclass of mammals is Eutheria, which contains all placental mammals, which make up the majority of mammals.
Yes. Shrews are placental mammals.
A rabbit is a placental mammal.
Dolphins are placental mammals.
Seals are placental mammals, as the young complete their development within the mother's uterus, attached to a placenta. They do not have a pouch like most marsupials, and they do not lay eggs like monotremes.
Neither. Bats are placental mammals, so they neither have a pouch, nor do they lay eggs.
Yes, leopards are placental mammals as are most mammals.