Hallmarks of Design Evolution is based on a key assumption that all the mechanisms within organisms can evolve incrementally so all intermediate mechanisms have some useful function. Dr Stuart Burgess A mechanism that can evolve one characteristic at a time while always having a useful function can be termed an reducible mechanism. subscribe now Join today to gain access to the rest of this article and many others. more info login If you are already a subscriber, log in to continue. log in access code If you have an access code, enter it here: Go free trial Get free access for 14 days: Sign up Click here to find out how we take care of your personal data.