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.
Major Sumerian city-states included Eridu, Ur, Nippur, Lagash and Kish, but one of the oldest and most sprawling was Uruk, a thriving trading hub that boasted six miles of defensive walls and a population of between 40,000 and 80,000. At its peak around 2800 B.C., it was most likely the largest city in the world.