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.
Humans did come out of Africa, says DNA. The DNA of living humans is revealing the secrets of our evolution, reports Jeremy Thomson. Archaeologists are still not sure when and where modern humans first appeared. Some believe that Homo sapiens evolved independently in several places around the globe.