There can also be little doubt that the tendency to vary in the same manner has often been so strong that all the individuals of the same species have been similarly modified without the aid of any form of selection.
Ezta ere ezin da duda handirik egin era berean aldatzeko joera sarri hain indartsua izan dela, non espezie bateko banako guztiak antzera eraldatuak izan diren ezertariko hautespenik gabe.