George:This article by Andrew Parker, from 2005, puts forward the theory > that the Cambrian Explosion is due to the evolution of eyes: > > http://www.abc.net.au/radionational/programs/scienceshow/cambrian-explosion-explained/3... > > This of course is just one hypothesis, among many. As far as I know there is no scientific consensus, which is why the subject is open for ID controversialists to play about with.- But that still doesn't explain how such complex eyes with bifocal lenses in trilobites appeared without precursors. It is only one of many advances of organ forms.