How did each of the following reasons contribute to the fall of the byzantine empire? justinian’s plague: belisarius and invading forces: the macedonians: the crusades: the ottoman turks:

Justinian's plague is another name for the Bubonic Plague or Black Death.
Belisaious and invading forces, I assume, would weaken the empire.
The Macedonians are a group of people that lived near this region, actually in the far east of the Byzantine empire.
The Crusades were "arguments" more like miniature wars used to convince others of their beliefs.
Ottoman Turks. Another conquering group that brought destruction, if i remember correctly.