 Without going into the familiar details, Darwinian processes fueled by undesigned, unplanned, chance variations that are in turn conserved or eliminated by way of natural selection would, it is argued, over time produce organisms exquisitely adapted to their environmental  niches.[9]  And since many of the characteristics traditionally cited as evidences of design just were various adaptations, evolution would thus produce entities exactly fitting traditional criteria of design. Natural selection, then, unaided by intention or intervention could account for the existence of many (perhaps all) of the Rs which we in fact find in biology. (A parallel debate can be found between those who believe that life itself requires a design explanation (Meyer 2009) and those proposing naturalistic explanations (see the entry on  life.)