<prompt> Hunter Schreger bands are:Dark and light bands of enamel seen in longitudinal ground sectionDark and light bands of enamel seen in horizontal ground sectionDark and light bands of dentin seen in longitudinal sectionDark and light bands of dentin seen in horizontal section  <response>: Hunter-schreger bands are due to change in direction of rods; and are regarded as a functional adaptation to minimize the risk of cleavage due to occlusal forces. 