Guy Threepwood
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- Oct 16, 2019
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Why does the fact that animals like the horseshoe crab, the shark and the crocodile, have not changed significantly from their ancestors become a problem? If a creature succeeds in its biological niche, it will not change dramatically. That's something that the theory of evolution predicts, and we see that prediction fulfilled.
I take your point, but I was responding to a poster saying how everything is always evolving- and this is a common characterization of the incremental progression originally predicted by the theory- that you might expect to find from constant variation, mutation
But I was pointing out the 'staccato' nature the record has revealed- and as Raup noted
If an office memo looks like the original after a million copies- you know it's from a master copy, not successive generations with cumulative errors, and that supports the earlier point made: variation occurs within predetermined ranges, with specific limits, independent of the underlying template which resists change.
We see the same in feral dogs, which after generations of intense breeding selection, very quickly revert to the 'base model' once the pressure is removed
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