Define and explain the columbian exchange.

Exchanges of plants, animals, diseases and technology transformed European and Native American ways of life. Beginning after Columbus' discovery in 1492 the exchange lasted throughout the years of expansion and discovery. The Columbian Exchange impacted the social and cultural makeup of both sides of the Atlantic.

The answer is option a. boundary line drawn by pope alexander iv in 1493.

If i remember correctly it was caused by people hurling bodies at a country for some reason and them they all became infected