What is the purpose of this article? a. to explain the importance of wearing helmets b. to inform the reader that it is okay not to wear a helmet c. to persuade the reader that it is okay not to wear a helmet d. to entertain the reader with a funny story about someone wearing a helmet

answer; i believe the correct answer is (the willamete valley);

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).