Which most directly led to an increase in food supply as part of the Green Revolution?

these civilizations were located around fertile rivers, where they could produce an abundance of crops

missouri compromise of 1820 which prohibited slavery

an ecozone is best defined as a substantial part of the earth that contains living beings.

explanation:

the four most common systems of greek government were: democracy - rule by the people (male citizens). monarchy - rule by an individual who had inherited his role. oligarchy - rule by a select group of individuals.