The Largest division in the geological time scale is the Precambrian Era.It lasted from around 4.6 billion years ago to 570 million years ago.
To become a Plastic Surgeon, one must complete a residency program in General Surgery. Dr. Jon Trevisani completed his General Surgery Residency Program at University of Kansas Medical Center in Kansas City, Kansas. The General Surgery Residency Program is 5 years which he becomes a General Surgeon. To enter the field of Plastic Surgery requires special training in called a Fellowship Training and/or advanced training Plastic and Reconstructive Surgery Residency Program which is 2 years.
During the residency, the graduate physician gains expertise in the diagnosis, treatment and overall management of patients, with a focus on the specialty she plans to practice. A residency program may last from three to eight years, depending on the specialty. Pediatrics and family practice, for example, require three-year residencies, while general surgery takes five years, according to the American Medical Association.