13. Explain the reasons for the shift to a sedentary lifestyle.
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One of the reasons behind the shift to a sedentary lifestyle was that certain areas could provide many of the necessities of life. Another reason being that the animals which used to be hunted had all gone extinct, and people had domesticate animals in able to have a source of protein.
Sources
Manual page 74-75
http://www.historyworld.net/wrldhis/PlainTextHistories.asp?historyid=ab63