Abstract

This paper attempts to show that if we carefully distinguish between the biological and metaphysical assumptions of Thomas Aquinas, it is possible, with the help of contemporary systems biology, to find good reasons for the thesis that the animation of a human individual takes place at conception. Systems biology is able to identify crucial events on the molecular level. The same would hold also for the possible human clone. In the paper I try to show that it is possible to maintain the notion of simultaneous animation along with the metaphysical assumptions of Thomas Aquinas, despite the fact that Thomas Aquinas himself advocated successive animation, due to his biological knowledge and the common opinions held in his times.