(Fourth objection): Granting that the ("seminal) reasons" of the
individuals are different, why should there be as many as there are
individuals which achieve existence in any one period? It is possible
that identical "reasons" might produce individuals differing in
external appearance; and we have even granted that this may occur
when the ("seminal) reasons" are given entirely. It is asked, is
this possible when the same "reasons" are developed? We teach that
absolutely similar things might be reproduced in different periods;
but, within the same period, there is nothing absolutely identical.