Final answer:
As the economy became more complex, the social structure of village life changed. Cities were essential to the growth of civilizations as they facilitated trade and provided a centralized location for various activities. Writing was a key invention for the Sumerians as it allowed for the recording and transmitting of information.
Step-by-step explanation:
The social structure of village life changed as the economy became more complex in early civilizations. With the development of agriculture and the specialization of labor, people began to settle in urban areas rather than leading a nomadic lifestyle. As populations grew, cities became essential for the growth of civilizations because they facilitated trade, allowed for the development of complex systems of government and religious institutions, and provided a centralized location for the exchange of goods and services.
Writing was a key invention for the Sumerians because it allowed for the recording and storing of information. In a complex society with specialized occupations and a growing economy, written records were necessary for record-keeping, trade documentation, legal matters, and the transmission of knowledge. Writing also played a crucial role in the development of literature, religion, and historical narratives, shaping the cultural identity of the Sumerians.