Two things that were introduced to the old world from the new during the columbian exchange were?
a. cattle
b. potatoes
c. corn
d. wheat

Potatoes and Corn were both initially grown by mesoamerican civilizations in the new world, or as it is known today, North and South America. Cattle and Wheat were both grown initially in Europe and were used to signify status and barter with others for goods just as much as they were used for eating.

Millatary capacity build was higher level