The processes that use the mechanisms are: Cellular respiration â ATP is generated by oxidation of organic molecules, the passage of electrons down an electron transport chain, and chemiosmosis. The final electron acceptor is almost always inorganic. Aerobic â the final electron acceptor is O 2.
The Sumerians lived in Mesopotamia around 4000 BC. Mesopotamia or the Fertile Crescent was a region in the Middle East between the Tigris and Euphrates rivers, in the territory of modern Iraq, Iran and Syria.
Ancient Man and His First Civilizations Sumer-2. Modern Iraq . Sumerian Cities . The cities of Sumer, first built around 4,000 B.C, {maybe before}, provide the world's first examples of genuine urban centers of large size.