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Thank you much for the comment, and let me offer my apologies that it took so long for the comment to appear on the site! A dumb configuration error on my part...

Much earlier on, I held the understanding that NS was THE mechanism behind evolution, but over the years I've some to realize what you spell out in a nice brief overview: there are many mechanisms at work, with interesting degrees of connectedness (or non-connectedness). This only serves, of course, to make the big picture all the more fascinating! Evolutionary biologists have so many paths to explore, all of them filled with great discoveries to be made. I'm jealous. : )

Thanks again, Heathen Dan.