No need to actually answer, just looking for some help.

1. How were the declines of classical civilizations the same and different?
2.. What role did religion play in the decline of these civilizations?
3. What were the main features of Kush, Axum, and Ethiopia? How were they the same and different?

for #1, I know that they were all invaded and had epidemics.
#2 I have no idea
#3. I know that they were all in the same place and Kush was isolated while Axum and Ethiopia were open and accepted Christianity.