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.
The Sumerians disappeared from history about 2000 B.C. as a result of military domination by various Semitic peoples. In particular, in about 2000 B.C. Sargon established an empire in Mesopotamia which included the area of Sumer. But long before Sargon's conquest Semitic peoples had been entering the area of Sumer.