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This theory seems to contradicts the entire structure of the nerve. Because in most cases with the human body everything is there for a reason. (with exception to the appendix) Nerves are equipped with a myelin sheath to help aid in the quickening of impulses sent between nerves. It aids as an insulator for the electrical impulses, which explains why impulses are slower on un-myelinated nerve cells. So with this theory it would make a major part of the nerve cell seemingly useless and for billions of cells in our body to have a completely useless feature seems overly far fetched.