How did food surpluses change the way of life in early human settlements?
a-villages needed to organize governments
b-the population decreased
c-more hunting and gathering was required
d-humans needed fewer tools and possesions

- encouraging nationalism

- returning to conservative political policies

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.