Yes you present "PE in a nutshell", in good details.We are only witnesses of your incredible dishonesty and misrepresentation of science, in these silly threads of yours, all of which make the exact same PRATT claims.
Just to point out one silly thing: the cambrian explosion is about the "sudden" appearance of species, you say? "Sudden", as over a period of 40 to 80 million years.
PE is a mechanism of evolution, yes.
It's rather easy....
Selection pressures are dynamic relative the the overal environment.
If the environment stays stable, then so do selection pressures.
In evolution, the "evolved" at some point will hit what is called a "local optimum" in stable environments. That is to say, that there are no more "easy" evolutionary pathways towards higher fitness. As a result at that point, selection pressures wil favour the status quo. ie: little or very slow evolutionary change.
When the stability gets disrupted, selection pressures change. The status quo is no longer favoured. Species no longer find themselves in "local optimums".
Now, evolutionare change "accelerates" again, until a new local optimum is reached.
That's what PE is in a nutshell.
You can return to your usually dishonest tactics now, while completely ignoring everything I just told you.
But let us read from the chaps who originated it, from their words as was an intoduction overview as follows:
Ah, just what I thought. To understand the science of why there are periods of rapid evolution then near stasis gaps in the fossil record.
In other words presented by the authors, evolution is finicky. AV may call it consistently finicky.
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