What social classes were common in most early civilizations

Why is it useful for historians to base certain studies on the analysis of historical periods

10. how were the mycenaeans and the minoans similar? they did not enslave anyone or tolerate slavery in any form. they had an organized and strong central government. they designed and built heavily fortified settlements. they reigned and traded in and around the aegean sea.

What is the tallest mountain range in south america? a guiana highlands b the patagonia mountians c the andes mountians d brazilian mountains