Evolution occurs when evolutionary processes such as natural selection (including sexual selection) and genetic drift act on this variation, resulting in certain characteristics becoming more common or rare within a population.
Evolution itaj alwaq wa id timitikwayen chund nefran n batil (eha nefran wan jansiy) d drift wan etari fal amuti wen icharayan s samalan iyyad taqqal nen a oharan meɣ a war n raqqis daɣ ichaɣib