adaptation is a subtractive process whereby an organism, in response to its environment, over some generation's time, opts for one of many possibilities already within its genetic makeup.

evolution requires a "monster" -- a step not within the genetic options already within that organism.

Almost all discussion (as far as I've read) has been explanations of how the changes necessary for survival could have been anticipated and called for on the one hand, and questions over irreduceable complexity on the other.