Some snakes have hipbones, which shows they once had four legs like lizards, their close cousins.
Once upon a time, snakes had legs. A new discovery reveals at least one had hips, too.
Use 'em or lose 'em.
That's profoundly relevant in a discussion of evolution Carl.
Great one carl!
This is not my opinion below but just another article discussing the uncertainty and related to the article that mcfarmer shared with us early last week about an extinct bird re evolving.
Biologists say they have found what is quite likely to be the first documented case of "re-evolution", suggesting that nature does indeed offer second chances - a species can evolve a new characteristic, lose it and then regain it.
"We think that blindness in cavefish is indeed Darwinian, but ultimately this disproves Darwin's original hypothesis of 'disuse'," said Cartwright. In new research, Cartwright explains that eyes are not lost by disuse, but rather, demonstrate Darwin's fundamental theory of natural selection at work -- with blindness selected as favorable and the fittest -- for living in a cave.
"If sighted fish swim towards the light, the only fish that stay in the cave are blind fish. They aren't trying to get to the light anymore because they can't see it. Which actually is a form of selection, and thus, Darwinian evolution in action," said Cartwright.