Which best describes recent changes in south korea?

reunification with north korea

shift to communist government

switch to command economy

growth of democracy

answer; i believe that the correct answer is (c) arctic tundra;

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).