How did interregional communication trade lead to intendified cultural and biological exchsnges among the peoples of eurasia and africa

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

Which of these innovations led to increased production in american factories in the early 1800s? a. the use of interchangeable parts b. the construction of canals c. the invention of the mechanical reaper d. the availability of electricity

Who was partially responsible for plotting the saint bartholomew’s day massacre? a. henry iii b. henry iv c. pope gregory vii d. pope innocent iii