how might the geographic zone of africa have affected interaction between people from northeaster and north western parts of the continet

Africa has helped the culture and civilization. It affected peoples living, trading, and resources. Gold, water,salt, food, rice.

d. migration

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).