Who predicted the population would outpace the food supply?

Thomas Malthus or just Malthus. He thought that due to overpopulation and climate change we would all run out of food and starve. i took the test

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).

a. men

and during later times male slaves as well