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A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A "civilization" means a society with large permanent settlements featuring urban development, social satisfaction, specialization of labor, centralized organization, and written or other formal means of communication. A river gives the inhabitants a reliable source of water for drinking and agriculture. Additional benefits include fishing, fertile soil due to annual flooding, and ease of transportation. The first great civilizations, such as those in Mesopotamia, Harappa and Ancient Egypt, all grew up in river valleys. Tigris River flourished near Mesopotamia civilization and river nile flourished near civilization of Egypt.
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i think its C. Laws protecting natural resources
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The Aztecs were not as strong as the Inca. They got defeated in war against other tribes many times. The Aztecs were the youngest out of the other 3 main tribes. The Aztecs' main city is built on an island in a Mexican lake named lake texcoco. For more info visit: www.knowledgenuts.com/2013/10/22/the-difference-between-the-Aztec-maya-inca-and-olmec/