Research shows that teacher effectiveness is the single most important school-based factor in student success. Students who have highly effective teachers for three years in a row will score 50 percentile points higher on achievement tests than students who have less effective teachers three years in a row (Sanders & Rivers, 1996).
A cuticle /ËkjuËtÉªkÉl/ , or cuticula, is a term used for any of a variety of tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Various types of cuticle are non-homologous, differing in their origin, structure, function, and chemical composition.
Hair shaft  the cuticle. The cuticle is the outermost layer of the hair shaft. The cuticle is a single row of cells, which may be identified at the level of the lower bulb. As the cuticle cells sweep upward as a single row from the matrix, they are seen in the upper part of the bulb.