for, as varieties, in order to become in any degree permanent, necessarily have to struggle with the other inhabitants of the country, the species which are already dominant will be the most likely to yield offspring, which, though in some slight degree modified, still inherit those advantages that enabled their parents to become dominant over their compatriots.
izan ere, aldakiek, nolabait iraunkor bihurtzeko beren herrialdeko beste bizidunekin borrokatu beharra dutenez gero, jada nagusi diren espezieak izanen dira ondorengoak sortzeko egokienak, eta hauek, nahiz eta gradu oso ahulean eraldaturik, beren gurasoak herkideen artean nagusi izateko gai egin zituzten abantailak heredatzen dituzte.