What role did American Indians play in the creation of mercantilism? O They leased land to settlers for the production of raw materials.
O They were required to help settlers navigate complicated waterways.
O They were forced to help settlers export raw materials to England.
They shared their expertise in fur trading with the English.

the answer is selfishly. hope this !

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).

i think the answer is b.