Final answer:
The Sumerians wrote on clay tablets using a reed stylus, creating durable records in the form of cuneiform script which has provided historical insights into Mesopotamian society.
Step-by-step explanation:
The Sumerians are credited with the invention of cuneiform script, an early form of writing. They did not write on papyrus scrolls, animal skins, or bamboo sheets. Instead, the Sumerians wrote on clay tablets. They used a stylus made of reed to press into wet clay to record various things such as laws, religious tracts, economic exchanges, and more. Over time, the writing evolved from being pictographic to phonetic in nature. These clay tablets would sometimes be fired, making the records durable and permanent. Many of these tablets have been discovered by archaeologists, providing insight into Mesopotamian life.