Family # of species; 1,620 genera including Senecio, Vernonia, and Aster. 22,750: A favorite of horticulturalists, the name of this family comes from the Greek word meaning 'testicle'. 21,950: Sometimes called the pulse family, includes the 'musical fruit'. 19,400: Includes corn, which was domesticated in Mexico some 8,700 years ago. 10,025
According to the U.S. Bureau of Labor Statistics, most students who enter dental schools complete 4-year bachelor's degree programs beforehand (www.bls.gov). Some applicants complete 2-3 years of college prior to applying to dental school and complete their bachelor's degree there.entists may choose to specialize in a particular field of dentistry, such as orthodontics or pediatric dentistry. To become a specialist, dentists must complete 2-4 years of postdoctoral education, and they might be required to complete a 2-year residency program in their field of choice.
It takes several years to become an orthodontist. You'll typically need to spend 2-4 years in an undergraduate program, four years in dental school and 2-3 years in a postgraduate orthodontics program.