In all such cases one of the two organs might readily be modified and perfected so as to perform all the work, being aided during the progress of modification by the other organ; and then this other organ might be modified for some other and quite distinct purpose, or be wholly obliterated.
Kasu hauetan guztiotan organo biotako bat aise eralda eta hobe zitekeen eta lan guztia berak egiteko moduan jar, beste organoaren laguntza hartuz eraldaketa prozesua burutu bitartean, eta orduan beste organo hau beste xede zeharo ezberdin baterako alda zitekeen edo zeharo atrofia.