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.
From around 4500 B.C., when the first settlements were established in Sumer, to about 1750 B.C., when the Sumerians ceased to exist as a people, is a stretch of close to three thousand years, and the reader might well ask where we get our historical information and how trustworthy it is.