As man can produce a great result with his domestic animals and plants by adding up in any given direction individual differences, so could natural selection, but far more easily from having incomparably longer time for action.
Gizakiak, etxe-landare eta animaliengan alde indibidual guztiak norabide jakin batean elkarri erantsiz, emaitza handia lor dezakeen bezala, horrelaxe egin dezake hautespen naturalak ere, baina askoz errazago, bere lana egiteko denbora gehiago duelako konparaziorik gabe.