Umayyad Caliphs managed to expand their empire because the Byzantine and Persian empires were weak.
Answer:
The answer is A. People can not change their places in society.
Explanation:
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this question needs more support in order to be answered.
This is called free trade. Free trade occurs when there are relatively few tariffs imposed on countries for the importation of goods. Completely free trade in this sense, however, is rare.
