Mesopotamis would ave less people in its population and would eventually disappear.
They would die.
They settled, farmed, produced a surplus and so developed a civilisation.
Farmers in Mesopotamia used excess food primarily for trade, exchanging surplus crops for goods and services with neighboring communities. This surplus also allowed them to support a growing population and contributed to the development of cities and complex societies. Additionally, some excess food was stored to prepare for leaner times or seasonal shortages. Overall, the management of surplus food played a crucial role in the economic and social structure of Mesopotamian civilization.
food surplus
The Mesopotamians traded surplus wheat and barley.
they were able tobring water to their crops
farmers obtain their inputs from the markets with their surplus income.
to help their surplus and the phaoh
cheetos
bazaar
You first ask whether their economy produced a surplus of food, which would enable them to spend resources beeyond mere subsistence. If the answer is yes, you then look at how they used this surplus. If it was used for civic works, public facilities and cultural activities, you can say that civilisation had come into being.
It resulted in a food surplus, which produced more than they needed, resulting in the ability to sell a lot of their crops to others that needed those farmer's produce.