How did lyell's views about the formation of major geological structures in the history of the earth differ from those of cuvier?

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).

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.