How did invading forces contribute to the fall of the Byzantine empire?

Invading forces contribute to the fall of the Byzantine empire by weakening the empire. ... The Byzantines created another barbarian group, called the Avars, to stop the Slavs. As the two groups were at war with each other, they were physically weakening the empire's structure.

Explanation:

the answer is c     : )

explanation:

i don't have an explanation because i don't know, but i think the answer is c because i googled it and google is right : ) just kidding google isn't allways right but the answer is still c. i hope this !

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.