Answer:
The first civilizations appeared in major river valleys, where floodplains contained rich soil and the rivers provided irrigation for crops and a means of transportation.
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B. Zhou They introduced the Mandate of Heaven to justify their overthrow the Shang dynasty.
Answer:
The National Commission on Terrorist Attacks Upon the United States, also known as the 9/11 Commission, was set up on November 27, 2002, "to prepare a full and complete account of the circumstances surrounding the September 11 attacks", including preparedness for and the immediate response to the attacks.
Explanation: