Which of the following is true of the economy of great zimbabwe?

a. it was based primarily on the salt trade.
b. it was based primarily on the gold trade.
c. it mainly depended on agriculture.
d. it was not impacted by agriculture.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.