In this case the gradual acquirement at an earlier and earlier age of the adult structure would be favoured by natural selection; and all traces of former metamorphoses would finally be lost.
Hori horrela izanik, hautespen naturalak helduaren egitura mailaz maila gero eta adin goiztiarragoan lortzea bultzatuko luke; eta azkenean lehenagoko metamorfosien aztarna guztiak galduko lirateke.