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Meet the Last Common Ancestor of Bats, Whales, Sloths and Humans

Placental ancestor

They may run, swim or fly. They may weigh less than a penny or more than a dozen school buses. From humans to whales to bats, the placental mammals—so named for the placenta that nourishes the fetus during development—are mind-bogglingly diverse. (The placental mammals are one of three major groups of mammals; the other two [...]

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