The Demiurge, a being completely based on the Eternal Realm is likened by Plato to a circle; "equidistant in all directions from centre to extremity - the most perfect and uniform of all figures, for uniformity is infinitely better than its opposite." ...
Geographical/Biological factors must separate the population preventing them to interbreed forcing them to create a new interbreeding population; these factors can be the formation of new streams, mountains, lakes, rivers etc Since these two populations can no longer interbreed there is a barrier in the gene flow, as different selective pressure and mutations start to occur and interbreeding continues, these two populations start to evolve in different directions and after generations these two population that were once the same species become 2 different species. ...
