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

Question

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Placental mammals are the most diverse and widespread group of mammals, with over 5,500 species found in almost every habitat worldwide. They range from tiny shrews and bats to huge whales and elephants. Marsupials and monotremes are restricted to certain regions, such as Australia and South America, while cetaceans are mostly aquatic and have a more limited range. Primates, while highly diverse, are mostly found in tropical regions and have a more limited distribution compared to the wide-ranging placentals.

Which Group of Mammals Exhibits the Widest Distribution and Greatest