The correct answer is - natural selection.
This is a typical case of natural selection, where we have a group of people that have similar physical traits, that are selected and than isolated from any external influence, so with interbreeding they manage to keep their physical traits for generations to come and thus create a population that resembles their initial ancestors.
In 494 BC the plebians detached and formed their own plebian council. they elected tribunes to protect their rights; with the tribunes they could not vote against unjust laws passed by patricians/the senate. the citizen assembly elected consuls, tribunes, and magistrates, could declare war and ratify peace treaties, and could approve or disapprove laws proposed by the Senate. They created laws that said patricians could no longer rule unjustly against them. Debt bondage was gone, priesthood was available, plebians could be in the Senate - but laws of the Senate apply to all while the citizen assembly's laws only apply to the plebians. (youre lucky im in class w/ my notebook rn lol)
