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.
To become an orthodontist, someone must complete four years of dental school, then two to three years of specialized study in orthodontics. Most general dentists can treat minor orthodontic problems and some do orthodontic work. But theyâre more likely to refer complicated cases to an orthodontist.