Emergence of Agriculture
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This cut-away of an early mud-brick dwelling (below) of the 'Ubiad culture of Mesopotamia suggests how elaborate village dwellings soon became, even given the severe limitations in building materials available on the Tigris-Euphrates flood plain.
Animals were kept in very close proximity to human living quarters. The flat roof-tops of houses were used as living space in the evening. Later, open central courtyards were developed.