Answer:
Though cultural features, language, clothing, and customs vary enormously from one tribe to another, there are certain elements which are encountered frequently and shared by many tribes.
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They all killed millions of people
Answer:
<h3><em>Khmer usually live in Cambodia, Thailand, and Vietnam.</em></h3>
Answer:
Unnecessary because he felt it would divide the nation.
Explanation:
Many experts believe that the decline of the ancient Aryan civilization was caused by environmental changes. Another theory suggests that a sharp rise in the Aryan population led to the decline.