ARM https://refractor.io/tag/arm/ ARM en-AU Mon, 12 Oct 2020 02:19:17 GMT Increasing occurrence of an extra arm artery shows evolution at work https://refractor.io/biology/median-artery-forearms-evolution-increasing-prevalence/ A new study suggests an increasing prevalence of a third forearm artery in humans over the past couple of hundred years

A human fetus transitions through a number of developmental stages in the womb. Some of these involve ancient traits, such as tails or reptilian muscles, appearing and then disappearing. While others are more temporary embryonic structures that regress once their permanent replacements develop.

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]]> Mon, 12 Oct 2020 02:19:17 GMT https://refractor.io/biology/median-artery-forearms-evolution-increasing-prevalence/ Rich Haridy