During their rule of china in the 1200s and 1300s, the mongols… a. executed thousands of scholars, artists, and artisans. b. set up a government based on islamic law and customs. c. ended the exchange of goods and ideas with europe. stabilized china and increased trade.

Which of these would be most useful in studying the effect of germs exchanged between the new and old worlds? a. a graph showing the number of europeans between 1492 and 1600. b. a graph showing the number of native americans between 1492 and 1600. c. a primary source description of the symptoms of an unknown disease affecting native americans in 1492. o d. a primary source description of the symptoms of an unknown disease affecting europeans in 1492.