Why was agriculture necessary for the development of civilizations?

The reason that we have permanent civilizations, is because of agriculture. With the development of agriculture, communities did not have to follow the herds in order to have food to eat. Now that there were permanent civilizations, there needed to be permanent homes for residents, so permanent homes were built. To produce the mass amounts of food, the farmers needed extra help, which led them to domesticate animals. The final issue of these civilizations were the lack of water in certain areas. 

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