Which group of mammals exhibits the widest distribution and greatest diversity?

Question

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Placentals exhibit the widest distribution and greatest diversity among mammals. They have a highly developed placenta, which allows for longer gestation periods and greater development of offspring. Placentals include common groups such as rodents, primates, carnivores, ungulates, and cetaceans, among others. Marsupials and monotremes are limited to specific regions and exhibit much less diversity in comparison.

Which Group of Mammals Exhibits the Widest Distribution and Greatest