John green begins by discussing one of the most obvious consequences of is it and what are the most immediate consequences for those societies?

The answer is: Created cities and civilizations. Division of social classes and labor force The farmers created the grain for supply, sparking the idea of trade Division of social classes and labor force
Agriculture provide a way for humans to produce food resources without fighting each other. In order to keep everything in place, social division was created for this civilization

I believe
1. density 2. material 3. pressure

may be wrong though :/