Iowa Cosmetology Practice Exam

High elevation in haircutting is used to create layers because it involves holding the hair at a perpendicular angle from the head and cutting it at a higher point. This technique allows for more hair to be cut at once, resulting in layered and textured hair. Option B, shortening the hair length, is incorrect because low elevation is typically used for that purpose. Option C, darkening the hair color, is unrelated to haircutting and is achieved through hair dye. Option D, straightening the hair, is incorrect because this can be achieved through other techniques such as using a flat iron or chemical straightening.