Which does not represent a power of congress? a. negotiating an economic treaty with china b. investigating an attack on a us embassy c. voting on the nomination of a supreme court nominee

answer; /// i believe that the correct answer is( it left behind rich

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).