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.
After completing medical school course work, any doctor must complete a residency program where they work as a doctor in a specific field, under the guidance of more experienced practitioners. To qualify as an orthopedic surgeon, you will need to complete a surgical residency in an orthopedics facility. During this five-year residency, you will participate in hundreds of arthroscopies, hand surgeries, foot surgeries, traumatic, pediatric and spinal surgeries, and log each to demonstrate your qualifications.