What was is NOT true about early civilizations? Choose 2. Select 2 correct answer(s) a) Only some of the earliest civilizations started in river valleys.

b) A group of people was considered a civilization once they could make nature work to their advantage.

c) Geography could be a challenge benefit to the people that settled an area.

d) Natural disasters and large-scale diseases affected civilizations' populations.

e) Division of labor and food surplus were developed before irrigation.​