Which of the following was one of india's most significant achievements during the classical era? a. the conquest of nearly all of asia, including japan b. the preservation the history through the ramayana c. the practice of monotheism d. the foundation of confucian philosophy

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.