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.
Modern Humans, Homo Sapiens Sapiens, have been on the earth at least 200,000 years...This has been confirmed by DNA research...The first Human migrations out of Africa started â¦ around 100,000 years ago.ow long ago did the first human walk on earth? According to the latest discoveries and theories, the genus Homo first came on the scene 2.3 to 2.4 million years ago, while the species Homo sapiens came into being 250,000 t â¦ o 400,000 years ago.