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> > DAVID's comment: [i]This contrasts with other rapid evolutionary events like the Cambrian explosion or the sudden bush of hominins. Either evolution is not a consistent progressive mechanism at all times or there is a monkey in the works, God, who picks and chooses when advances happen.[/i]
> > 
> > dhw: Could it not be that different local environments require minor changes (finches’ beaks, froggy fiddles) or major changes (when whales switch from land to water), whereas major widespread environmental changes (the Cambrian) spark major innovations?
> 
> You and I will always differ on where the spark comes from. The increase in oxygen provided the energy for the complex animals of the Cambrian to appear. It did not require their appearance. As for the hominin bush, as savannah appeared only the pre-homos bothered to come down from the trees, but 23 million years ago monkey lumbar spines were showing preparatory changes while still in the trees. It seems to me only God can provides the push to advance.