Today, the vast majority of mammals are

Name: Today, the vast majority of mammals are
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The vast majority of mammals today are placentals. This group includes humans, whales, elephants, and many other familiar animals. Placental mammals give birth to relatively developed offspring, unlike monotremes, which lay eggs, and marsupials, which give birth to undeveloped young that typically complete development in a pouch. Multituberculates, an extinct group, are not among the majority of today's mammals.

Today, the Vast Majority of Mammals Are