Evolution thought of in a point A to B sort of way where there is a foward or reverse isn't realivent to the theory of evolution because evolution is active.
Evolution is not linear, however it appears so in retrospect. Evolution is reactive or as I like to think of it, circumstantial.
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You're basing off the fact that evolution can reverse off of what? If you believe that everything is in a full motion forward, what will humans evolve into next?
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Circumstantially, it can reverse.