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 were the most extraordinary people who ever lived on the face of the earth. They seemed to come from out of nowhere, and they single-handedly invented civilization when most of the rest of the world was still living in the Stone Age. Whatâs more, they did it thousands of years before anyone else.tatuettes from the Ubaid period, the prehistoric era of the Sumerians. This kind of statue, along with the Sumerians' sudden rise to civilization, has caused some people to speculate that the Sumerians were assisted by aliens from outer space.