Randy: Evolution always has an inevitable outcome--change.

Me: Natural selection also rewards species that don't change. 

Stabilizing selection is known to be the most
prevalent type of natural selection; it favors the
intermediate (average) phenotype of the trait, and
in doing so it removes the extreme phenotypes of
the trait from the population.

Stabilizing selection reduces genetic variability in the
population. It is generally accepted that stabilizing
selection maintains the DNA and protein sequences over
evolutionary time.

note: This may be the force underlying the tendency of artificially selected species to "revert." The unusual variations created by man or natural selection may be temporary, with species reverting to the original type, which was selected over the long term for its stability.

PLB

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