I have a book that says "Inversions are ways of playing notes from a parent scale." From C maj, 1st Inversion starting with D and playing through D. 2nd inversion E -E etc. 1st Inversion starts with 2nd degree, 2nd Iversion starts with 3rd degree of the scale. "Modes are called functional variations on the seven steps of the major scale." Dorian based on 2nd Degree, Phrygian based on 3rd degree etc. What is the difference? Appears to be saying the same thing to me. Thank you.