i doubt this is true. not all mutations will result in beneficial traits, but some do. it's a little random in that respect. trial and error has been mentioned, though there is no real attempt at doing trials. they happen, and there are results. some good, most bad.
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I must say agreeing with Taks is strange, but it goes to show his ideas are his own and not a predetermined role like alot of people...Kudos
I was listening to NPR the opther day and they had this cell biologist saying that the "mutations" that often result in "evolution" seem to respond more to outside stimulus then we ever thought before. Basically that mechanism that causes these changes in the way cells are made, may indeed respond more to the enviroment of the creature then we previously thought. Not an arguement for Intelligent design, mind you, but one that more so could put the success of evolution more into perspective.