Common Design Features: All spring aligners are available for both arches. Standard design is 3-3, although 4-4 is very common & often used when canine correction is desired. Wraparound designs are also available with Mushroom & Super Spring designs.
exists and is an alternate of . The most generally accepted scientific theory states that the first humans (defined as members of the genus Homo) originated in Africa. The oldest known fossil of a human ancestor (a female Ardipithecus ramidus specimen nicknamed Ardi, 3.2 million years old) at a site called Aramis in the Middle Awash region of the Afar Desert in Ethiopia.
According to the multi-regional model, an archaic form of humans left Africa between one and two million years ago, and modern humans evolved from them independently and simultaneously in pockets of Africa, Europe, and Asia.y around 100,000 years ago, several species of hominids populated the Earth, including H. sapiens in Africa, H. erectus in Southeast Asia and China, and Neandertals in Europe. By around 30,000 years ago, the only surviving hominid species was H. sapiens.