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.
While the king of a Sumerian city lived in a luxurious palace, most of his people lived in very small thatched houses that were crowded together and separated by narrow alleyways. This was evidence of a distinct social system that was in place in Sumer. The highest class was the ruling class and priests.