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A comment on New finding: 600M years ago, a single mutation changed everything. Parent comment

Re:New finding: 600M years ago, a single mutation changed ev... by GFK_of_xmaspast on Monday January 11, 2016 @08:52PM (#10885041)
One obvious local sticking point is mammalian cervical vertebrae (a couple critters have more or fewer, but basically you're stuck at 7 whether you're a rat or giraffe)
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