Two of the cultural similarities of early river valley civilizations were _____. Select all that apply.
reduction in the amount of food needed
forming of organized government as population increased
overpopulation, causing people to move from urban setting to rural one
conversion of more land to productive fields
reduction in the amount of food needed
forming of organized government as population increased
overpopulation, causing people to move from urban setting to rural one
conversion of more land to productive fields