True or false: Through practice and training, is it possible to expand your voca

Question:

True or false: Through practice and training, is it possible to expand your vocal range?

If possible, please include references that back up your answer.

Best Answer - Chosen by Asker:

Sure, your vocal cords are muscles and it is possible to strengthen them, stretch them, whatever you want. Go see your Concert Choir Teaqdher (or chorus if that's what they call it in your area) and ask for some range exercises. He or she probably has a whole fist full they can give you.