And we have evidence of aberrant groups having suffered severely from extinction, for they are almost always represented by extremely few species; and such species as do occur are generally very distinct from each other, which again implies extinction.
Eta badugu, izan ere, talde desbideratu horiek iraungipen zorrotza jasan dutelako frogarik, gehienetan espezie gutxi-gutxik errepresentaturik ageri baitira, gutxi hauek ere eskuarki bata bestetik oso bereiziak direlarik, iraungipenaren seinalea hau ere.