The Mississippian civilization was organized into a hierarchical society centered around districts
territories
chiefdoms

It was composed of a series of urban settlements and satellite villages (suburbs) linked together by loose trading networks. The largest city was Cahokia, believed to be a major religious center. The Mississippian way of life began to develop in the Mississippi River Valley (for which it is named)

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

answer; repetitive thoughts; ritualistic behaviors;