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Scientists Have Discovered That Babies In The Womb Have Lizard-Like Muscles That May Indicate The Remnant Of Our Evolution, About 250 Million Years, From Reptiles. The Muscles, Except For The Ones In The Thumb, Are Deleted Before Birth. But When They Persist, May Be Linked To Limb Defects. But Why Make Them Only To Delete Them Afterward?

Babies in the womb have lizard-like hand muscles – BBC News

https://www.bbc.com/news/health-49876827

They are 250-million-year-old “evolutionary remnants” most lose before birth, scientists say.