The thing that "takes place" is mutation. The accululation of mutation occurs over millions of years but mutation is observable. The missing link arguement is like saying "Despite the fact that there is a gradual rise in complexity in the fossil record and that limbs and other traits have clear, traceable linage represented by thousands of agreeing finds, the fact that there isnt a fossil with MORE subtle changes between the species I've personally seen, means the mossing link has never been found therefore throw out all of evolution." Lawl