Which of these was most responsible for the fall of the byzantine empire? political reunification with the western roman empire raids from vandals, huns, and other barbarian tribes earthquakes, floods, and the eruption of a volcano attacks from european crusaders, arabs, and turks

ayatollah khomeini can best be described as the leader who declared iran to be an islamic republic.

answer; taking up arms to defend the nation;

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.

i believe it is the second one.   if correct plz mark brainliest.