>>>>You could call it evolution, but there is nothing to say that this sort of "evolution" is permanent since, as with the moths, if the stimulus is removed, the species reverts to its original state<<<<

The assumption of an "original state" troubles me. There is no such permanent thing; no baseline from which things diverge. There is merely the adaptive response of the organism to its' environment at a point in time. To say that the moths "reverted" is incorrect. They adapted to a new (to them) environment. 

Dick Marron

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