If the conditions of life change and the form undergoes modification, uniformity of character can be given to the modified offspring, solely by natural selection preserving similar favourable variations.
Bizi-baldintzak aldatu eta formak eraldaketarik jasanez gero, hautespen naturalak antzeko aldakuntza faboragarriak kontserbatuz ez bestez eman diezaieke aldaturiko ondorengoei uniformetasuna.