Before revision: Radiation results in the generation of new subclades by bifurcation, but in practice sexual hybridization may blur very closely related groupings.Columbia EncyclopediaOxford Dictionary of EnglishOxford English Dictionary As a hypothesis, a clade can only be rejected if some groupings were explicitly excluded.
After revision: Radiation results in the generation of new subclades by bifurcation, but in practice sexual hybridization may blur very closely related groupings.Columbia EncyclopediaOxford Dictionary of EnglishOxford English Dictionary As a hypothesis, a clade can be rejected only if some groupings were explicitly excluded.