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Message: <blockquote data-quote="A Dangerous Chinese Bat" data-source="post: 1478766" data-attributes="member: 17997"><p>Mutations don't need to be "unidirectional". They can go in various directions, it does not matter. All that has to happen is for a mutation to provide a fitness advantage. Then it spreads, and those copies of the mutation, which are inherited across generations, then act as a platform upon which further mutations that provide an additional fitness-benefit can build upon. And natural selection has an incomprehensible amount of time to achieve gradual, cumulative adaptation - and the medium of DNA to accomplish it.</p></blockquote><p></p>