Rob:
Here is that argument:
When DNA was first discovered, it was assumed (because of it's peerless molecular complexity) that it had evolved into the complex molecule that it is today, through random variations over time (natural selection). This is still the assumption of many today.[...]
'Random variations over time' would not really be the same thing as 'natural selection.' Natural selection enters the picture after variations have taken place. It decides which varations are passed on and which are not.
Intersting thing about Darwin's
Origin of Species is that it doesn't really say much about the origin of species. Darwin proposed 'mutations' as an origin but couldn't say much more. DNA studies lay far in the future. The really exciting thing is that the science of genetics, once it advanced far enough, could bear him out. DNA studies show us how these mutations happen.
The novelty in Darwin's argument lay in his postulation of common ancestry for all life forms and in the idea of
natural selection. The latter doesn't really tell you how species originate. It tells you why they survive.
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Archer
All species are transitional.