Galis F. Why do almost all mammals have seven cervical vertebrae? Developmental constraints, Hox genes and Cancer. J Exp Zool (Mol Dev Evol) 1999;285:19-26.Galis, F. 1999 . Why do almost all mammals have seven cervical vertebrae? Developmental constraints, Hox genes, and cancer. J. ...
From studying turtle embryos, scientists know that a turtle's shell originates from its ribs and vertebrae. This form originated over 250 million years ago, when the ancient ancestors of modern turtles that lived on land had evolved half a shell, expanding from the lower ribs and covering thei...
A nice simple explanation would be that that all the elements areSupersaurusand that’s just whatSupersaurusis like: super-long neck, forequarters proportionally larger than hindquarters, perhaps in a slightly more convergent-on-brachiosaurs way. That would work just fine were it were not that ...