Final answer:
Hunter-gatherer groups did not settle in Mesopotamia more than 20,000 years ago. The earliest settlements in Mesopotamia, where agriculture developed, began around 8,000 BCE.
Step-by-step explanation:
Hunter-gatherer groups did not settle in Mesopotamia more than 20,000 years ago. The earliest settlements in Mesopotamia, where agriculture developed, began around 8,000 BCE.