At least two thirds of all central american people are

americans experinced rations on food and be gangrene their own food and feed their families going to go over jobs that were orginally only for men.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.