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 Fall of the Sumerian Cities. Around 2000 B. c. both Sumer and Akkad were attacked by barbarian invaders. The Amorites from Syria seized control in Akkad, and built a powerful new state around the city of Babylon. The Elamites from Iran took the city of Ur, sacked it, and burnt it down.