Well, people started specializing in things and if they couldn't get something because they didn't know how to make it, they would trade for it. Fast forward 8000 years, companies like Coca Cola make coke and fanta and others can't make it because they're specialized for it. They trade for it with the entire world and other companies make things that Coca Cola owners buy.
Answer:
Option: d) They all had sufficient water and fertility for agriculture.
Explanation:
The earliest civilizations were able to emerge in the regions of Mesopotamia, Egypt, Indus valley and China because of rivers that were present there. These rivers included the Nile, Tigris–Euphrates, Indus, and Huang (Yellow). The rivers played a crucial role in providing each of the civilization to thrive prosperously with the availability of fertile land. Rivers became the regular supply of water for irrigation, drinking, fishing, and trading.
Due to the fall of the Soviet Union.
Answer: The emperor's role was to enforce doctrine, root out heresy, and uphold ecclesiastical unity. Both the title and connection between Emperor and Church continued in the Eastern Roman Empire throughout the medieval period (in exile during 1204–1261).
Explanation: Hope this helps
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