<span>The mountains and deserts in western and southwestern China slowed the exchange of ideas</span>
I’m not exactly sure what you are talking about. Maybe Emperor Constantine from the Byzantine empire? He built the Hagia Sophia
Answer:
my joints worked together and my leg muscles helped me from falling over. when you sit or stand you use the muscles in your legs to push up off the chair or to sit back down
The Byzantines spread Christianity mostly by sending out missionaries for the Greek Orthodox Church.