Based on the principle of Parsimony (or Occam's razor), the tree that is favored is the one with the fewest evolutionary changes needed to be assumed over all traits in all groups.
Fal almadda wan Parsimoni (meɣ Occcam razor) , ahishk wa ilan irrizaɣ inta s wa ilan imutiyan madroynen s ilzam aɣabal nasan fl samalan n taqqimen fuk ti yadnen