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There is another form of evolution. Sexual Selection. It is almost identical to Natural Selection but instead of selection by improved survivability, it involves selection by improved attraction to the opposite sex, and thus descendants.
I agree with you. I would add that sexual selection isn't independent of criteria for 'survivability', as you succinctly put it. The classic example of the peacock is a case in point. Sure, the peahen is attracted to males with showy plumage. What the plumage tells the female, however, is that this male is strong and agile enough to drag this tail around and avoid predators long enough to survive and mate, and that he can pass these superior genes on to her offspring. Along with the tail.
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