Until recently, textbooks often referred to the Americas as the “New World,” Europe as the “Old World,” and used the term “Columbian Exchange” to describe when the two “worlds” met. Why do you think this language has fallen out of use? What do those phrases tell you about how historians and textbook authors thought about the Americas and Europe? Can you think of some other common descriptive words that have been retired or changed recently?

Christopher Columbus introduced horses, sugar plants, and disease to the New World, while facilitating the introduction of New World commodities like sugar, tobacco, chocolate, and potatoes to the Old World. The process by which commodities, people, and diseases crossed the Atlantic is known as the Columbian Exchange.

Explanation:

(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.

sonar maybe? ? i dont know the choices