Use columbian exchange in a sentence

The Columbian Exchange was the exchange of goods between the Old World (Africa, Australia, and Asia )and the New World ( Americas ).

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(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.