Organs, originally formed by the aid of natural selection, when rendered useless may well be variable, for their variations can no longer be checked by natural selection.
Daitekeena da oso hasiera batean hautespen naturalaren laguntzaz eraturiko organoak, alferreko bihurtzean, aldakorrak izatea; hautespen naturalak jada aldaketoi galgarik jartzerik ez duelako.