The Comstock–Needham system is a naming system for insect wing veins, devised by John Comstock and George Needham in 1898. It was an important step in showing the homology of all insect wings. This system was based on Needham's "pretracheation theory" that was later discredited by Frederic Charles Fraser in 1938. Using only the above description and what you know about the world, "John Comstock discredited the "pretracheation theory"." is definitely correct, incorrect, or inconclusive? 