As organs in this condition would formerly, when still less developed, have been of even less use than at present, they cannot formerly have been produced through variation and natural selection, which acts solely by the preservation of useful modifications.
Gisa honetako organoek lehenago, egun baino gutxiago garaturik zeudenean, are baliagarritasun gutxiago izanen zutenez gero, ezin sor zitezkeen lehenago aldakuntza eta hautespen naturalaren bidez, honek eraldaketa baliagarriak gordez bestez ez baitu iharduten.