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.
Sumerian Cities. Sumerian towns and cities included Eridu, Nippur, Lagash, Kish, and Ur. The cities differed from primitive farming settlements. They were not composed of family-owned farms, but were ringed by large tracts of land. These tracts were thought to be owned by a local god.