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I don't know if the diversity of dogs represents evolution or selective breeding from man, but I have known dogs and cats to possess individual, unique personality traits and intelligence that are far beyond what the Bible calls voided minds of brute beasts.
I've often used the variety found within dogs and the role of selective breeding in evolution discussions. Frankly, given the advancements in medicine I see the human race over the next three generations getting equal diversity (if it hasn't already!). Folk who wouldn't have survived or been able to pass on their genes 20 years ago, now can. That is going to massively widen the gene pool of the human race.
And in my opinion that's a good thing....The fewer variations found within a species, the closer that species is to extinction.
All according to my untrained pop science of course....
Thanks for the ping!