Did agriculture have an effect on mesopotamian civilization?

Agriculture had an effect on all of civilization, not just Mesopotamian! The adoption of agriculture on our world was an immense step towards the building of cities. Prior to agriculture, we were hunters and gatherers. We moved with the herds and the seasons, going where it was green when it was green, and moving on when it came time to do so. We were nomadic, but all of that changed when we learned that we could plant seeds and simply wait for them to grow! A whole new world opened up for us, literally. We were able, then, to create villages that all worked towards the planting/harvesting of crops, and also the domestication of animals.

This cooperative effort in farming freed time up for people - we didn't need to spend all of it hunting and gathering, and so we had time on our hands to do things like establish an organized society. We created public works projects, like roads and irrigation. Small villages grew into big villages, and big villages into cities. Before we knew it, we had walls around these cities to fortify them against marauding invaders.

Aside from freeing up our time, agriculture allowed us to remain in one place for long enough to establish order among the people. With the free time we began to earnestly produce art - music, paintings, pottery, and more.

Civilization as we know it would not exist without the adoption of agriculture; it is what many scholars view as the most important contributing factor to civilization's rise.