What pair of Chinese developments has the most impact on increasing trade? A. the magnetic compass & paper.
b. acupuncture & the silk road.
c. bronze vessels & calligraphy.
d. the iron plow and the great wall.

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)