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Most humans think of the placenta as something that gets tossed out after childbirth. In fact, its appearance millions of years ago was a significant evolutionary development that gave rise to the vast majority of mammals alive today, from bats to whales to humans. Until now, scientists believed that placental mammals first appeared some 125 million years ago.

Most humans think of the placenta as something that gets tossed out after childbirth. In fact, its appearance millions of years ago was a significant evolutionary development that gave rise to the vast majority of mammals alive today, from bats to whales to humans