Pero no todo va a ser lucha despiadada, la tautología tiene también su lado bueno y así cuando las condiciones sean favorables, serán más los que sobrevivan:   The obvious explanation is that the conditions of life have been highly favourable, and that there has consequently been less destruction of the old and young and that nearly all the young have been enabled to breed. Their geometrical ratio of increase, the result of which never fails to be…