It’s not even darwin-ism. It can’t be.
No one is going through natural selection because of an extra artery in their fore-arm. No one is surviving better because of it and no one is having more babies because of it. It probably has more to do with change in the diet and nutrition of mothers during pregnancy over the last several centuries.
“It probably has more to do with change in the diet and nutrition of mothers during pregnancy over the last several centuries.”
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I once had someone tell me he knew evolution had to be true because people were getting taller - really. I had to explain how diet and nutrition works to him. He was a high school teacher - and of course, a devoted liberal.