Respuesta :

they lacked highly needed natural resources, like stone, wood, or metal.

Answer:

Sumer is the earliest civilization in Mesopotamia flourished with the help of trade with the neighboring regions. Trade helped the Sumerians by gaining them wealth and rich. Sumerian established in the valleys of the Tigris and Euphrates helped the farmer in cultivating crops and grain. The people acquire the resources by exporting grain, textiles, and oils to foreign cities and imported wine, timber, stones and precious metals.