Explanation:
language, clothing and customs differed greatly among the various indian tribes
Answer: Pax Mongolica, also known as the Mongol Peace was a period of time where peace, stability, economic growth, cultural fusion and cultural development were happening around the Mongol's occupied territories. Pax Mongolica was a time of spreading different ideas and a great cultural expansion around Europe and Asia.
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Both had major rivers and dependable flood
B - bodhisattvas in Mahayana Buddhism
I think it's C i hope I help