Civilizations

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Across
  1. 4. System of communication that allowed humans to cooperate.
  2. 5. Animals or plants changed by humans for their use.
  3. 6. Extra food produced thanks to farming.
Down
  1. 1. First form of writing used in Mesopotamia.
  2. 2. The way of life where people move from place to place to survive.
  3. 3. The process of growing crops and raising animals.