The Sumerians were the world's first civilization. Which of the following are they credited with first developing?

The Sumerians, who lived in ancient Mesopotamia (modern-day Iraq), are credited with several significant developments that contributed to the foundation of human civilization. Some of their notable achievements include:

1. Writing System (Cuneiform): The Sumerians are credited with the invention of one of the earliest writing systems known as cuneiform. They used wedge-shaped marks on clay tablets to represent words and sounds.

2. City-states:Sumerians established some of the world's first city-states, such as Ur, Uruk, and Lagash. These were complex urban centers with centralized political and economic structures.

3. Wheel: Sumerians are often credited with the invention of the wheel, which had a profound impact on transportation and various industries.

4. Agriculture:The Sumerians were among the earliest societies to practice agriculture on a large scale. They developed irrigation systems to control water flow and support crop cultivation.

5. Ziggurats: Sumerians built monumental structures called ziggurats, which were massive step pyramids used as religious temples and administrative centers.

6. Mathematics and Astronomy: Sumerians made contributions to mathematics, developing a base-60 numbering system and making astronomical observations that influenced later civilizations.

It's important to note that while the Sumerians made significant contributions to the development of civilization, they were not the only ancient culture to achieve important milestones around the same time. Other civilizations in different parts of the world also made noteworthy advancements.