05/31/07
Not long ago I insisted that the horse/donkey/mule distinction revealed a case of an evolutionary transitional species
in common knowledge — in this case, the donkey is transitioning from the horse. Now, that same case could be applied to the problem of speciation dredged up by Sam Brownback's public pronouncements on a subject he knows little about, microevolution and macroevolution. Here's John Derbyshire on his argument:
Under Brownbackian evolution—micro yes, macro no—this can't happen. They can't go on diverging. They can only get so different, no more. The divergence must slow down and stop. But... what stops it? What's the mechanism?
Perhaps this is why we need a God . . . to prevent small changes in speciation from adding up to major changes!
It's obviously why Brownback needs one. For his argument.
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