How did the first humans adapt to and modify their environment? (this has to do with irrigation). in the response, use the words: domesticate, agriculture, irrigation, civilization , silt, society, surplus, and river valley.

The first humans adapted and modified their environment, by manipulating soils and rich silt form the irrigation of the river valley. This allowed for greater use of agriculture which helped the population sizes increase and eventually evolved into a surplus. The humans began to domesticate animals and use them for work. All these adaptation and modifications let civilization eventually grow to the society it is today.