Thus, on the theory of descent with modification, the main facts with respect to the mutual affinities of the extinct forms of life to each other and to living forms, are explained in a satisfactory manner.
Era horretan, eraldaketadun ondorengotzaren teoriaren barruan, forma organiko iraungiek elkarrekin eta forma biziekin dituzten ahaidetasunei buruzko egitate nagusiak asegarriro azaltzen dira;