Answer:
Teacher means that the fall of empire occurs due to various reasons not due to one reason.
Step-by-step explanation:
The teacher means that the fall of the roman empire was not due to only one factor but it was done due to various factors. Invasions by barbarians, an unstable government, and pure laziness and negligence are the factors that are responsible for the fall of the roman empire. The unstable government causes less focus on the barbarians that invade the roman empire. The empire neglect the serious problems that the empire experience so this negligence causes the fall of empire.