Experimental procedure. cite the reason for each of the five cautions in the experiment

The answer is if strong odor do not inhale, always cover your nose or wear a face mask, then avoid breathing vapors because this might harm your lungs and even damage something in your health and avoid skin contact this might burn your skin or even hurt by the residue.  Avoid inhalation and skin contact.

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).

these civilizations were located around fertile rivers, where they could produce an abundance of crops