Drum majors are usually assigned by the band director, at my school you have to talk to your band director to be eligible for drum major, and at the end of the year he announces the new drum major, but schools might do it differently.
Live football has become a major business because of the people who watch it.
Nursing you need to major in nursing in order to become a nurse and work at a hospital.
Yes, you can! Your major does not have to be related to what you what to become, but I would strongly recommend a major that helps more with medicine, such as biology, chemistry or biochemistry.
law
Physics.
ethology is a major itself, but not many colleges have a major in it i can think of 15.
biology or chemist! there is no such thing as a pre-med major
Yes.
Journalism
Major in it at collage.
Psychology.
To become a teacher, you will have to major in education. You can always minor in history. That should help you get a history teaching position.