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.
3.) You will attend a 4 year medical school. Near graduation you will need to apply for a residency program at a graduate school of medicine. 4.) Once in a residency program it will depend upon which field you enter as to how long your residency will be. Some are 3 years such as family practice.Surgeons can be in a residency program for 4 to 5 years.Once you are in a residency program you can specialize in your chosen field. So the total time to become a brain surgeon or Neurosurgeon, not counting high school, is roughly 12 years.o become a brain surgeon you need to take the following steps: 1.) Graduate from high school and apply and get accepted to a university. 2.) At a 4 year university you will w â¦ ork towards a bachelors degree in pre-medicine or pre-health with at least a GPA of 3.5 or better.