What year did the western half of the empire fall

How was classical persia's extensive network of roads important to its civilization?

Which of the following could affect the human population? a hurricane makes landfall on an uninhabited island. a deadly virus emerges that can pass from human to human. a civil war breaks out in italy. a solar eclipse occurs.

How does the concept of competition relate to the arms race between the us and the soviet union during the cold war?