13. To this perpetual evidence - perfectly independent of the discussions on the moment of animation[¹⁹] - modern genetic science brings valuable confirmation. It has demonstrated that, from the first instant, there is established the program of what this living being will be: a man, this individual man with his characteristic aspects already well determined. Right from fertilization is begun the adventure of a human life, and each of its capacities requires time- a rather lengthy time- to find its place and to be in a position to act. The least that can be said is that present science, in its most evolved state, does not give any substantial support to those who defend abortion. Moreover, it is not up to biological sciences to make a definitive judgment on questions which are properly philosophical and moral such as the moment when a human person is constituted or the legitimacy of abortion. From a moral point of view this is certain: even if a doubt existed concerning whether the fruit of conception is already a human person, it is objectively a grave sin to dare to risk murder. "The one who will be a man is already one."[²⁰]