Hence, when in former times an immigrant first settled on one of the islands, or when it subsequently spread from one to another, it would undoubtedly be exposed to different conditions in the different islands, for it would have to compete with a different set of organisms;
Beraz, antzinako denboretan horrelako etorkin bat irla horietariko batera lehen aldiz iristean, edo geroxeago irla batetik bestera hedatzean, baldintza ezberdinen pean aurkituko zen dudarik gabe, organismo multzo ezberdinarekin lehiatu beharra izanen baitzuen;