How was a polis organized in ancient greece? ( )

Ancient Greece land was made up of many mountains and valleys that often divided Greek societies. These city-states were known as a “polis”. The “polis” often were styled as “citadels” which offered protection to citizens during times of war. With many coming to the area many of these cities flourished becoming important centers.

These polis often functioned independently and had different government styles such as oligarchy (small ruling groups), monarchy (one king or ruler) , and democracy (elections by the citizens for power).

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

it should be d or b but i'm sure it's d