Choose the best answer to complete the sentence. Directional selection can be distinguished from disruptive selection by _______.
Athe elimination of extreme variations of traits
Bselection for two extreme variations of a trait
Cthe preservation of gene frequencies
Dselection for one extreme variation of a trait
Athe elimination of extreme variations of traits
Bselection for two extreme variations of a trait
Cthe preservation of gene frequencies
Dselection for one extreme variation of a trait