Final answer:
Ancient Egypt's reliance on the annual flooding of the Nile River supported a unique agricultural system, unlike Mesopotamia. This development made Egypt unique because it provided a stable and abundant food supply, leading to the growth of cities and the establishment of a centralized government.
Step-by-step explanation:
A major difference between ancient Egypt and Mesopotamia was their approach to agriculture. Egypt relied on the annual flooding of the Nile River, which provided a predictable source of water and fertile soil for farming. This allowed for the development of a unique agricultural system that supported the growth of surplus crops and a large population. In contrast, Mesopotamia did not have the benefit of predictable flooding, and instead relied on irrigation systems that were less efficient compared to Egypt.
This development made Egypt unique because it provided a stable and abundant food supply, leading to the growth of cities and the establishment of a centralized government. The surplus crops also allowed for specialization in other areas, such as writing and record-keeping. The use of papyrus in Egypt further contributed to their advanced record-keeping systems, unlike Mesopotamia.