What service did the byzantine empire perform for european civilization?
a. it conquered the turks of central asia.
b. it held back muslim invaders for several centuries.
c. it provided popes to lead the catholic church.
d. it converted many muslims to christianity.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

35 is your answer because i looked it up