To what does the list of items below refer? *investors lost their money. *businesses and workers were unable to repay loans, resulting in bank failures. *a downward cycle in the global economy occurred. a) effects of the 1929 stock market crash b) rise of totalitarian governments in europe c) economic recession following world war i

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.