All of the following are sources of prejudice and discrimination except: a. the social environment c. subjugation b. personality influences d. competition for resources

(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.

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )