What is rheumatoid arthritis? Rheumatoid arthritis is an autoimmune disorder that causes chronic inflammation of joints. Rheumatoid arthritis (RA) tends to begin slowly with minor symptoms that come and go, usually on both sides of the body, and progress over a period of weeks or months. Symptoms of this chronic disease vary from person to person and can change from day to day.
Sahelanthropus was the earliest, dating 7-6 million years ago. Orrorin lived about 6 million years ago, while Ardipithecus remains have been dated to 5.8-4.4 million years ago. At present, the vote is still out as to whether any of these three primates were in fact true hominins and if they were our ancestors.he earliest australopithecines very likely did not evolve until 5 million years ago or shortly thereafter (during the beginning of the Pliocene Epoch) in East Africa. The primate fossil record for this crucial transitional period leading to australopithecines is still scanty and somewhat confusing.
When the bones of two early humans were found in 1967 near Kibish, Ethiopia, they were thought to be 130,000 years old. A few years ago, researchers found 154,000- to 160,000-year-old human bones at Herto, Ethiopia.hese are the oldest well-dated fossils of modern humans (Homo sapiens) currently known anywhere in the world, the scientists say in a summary of the study.