This is a science question: all drugs can be described as substances that a. result in addiction. b. relieve pain or other symptons of illness. c. cause a change in a persons body or behavior. d. are illegal.

This anterior tooth has a single root and sharp incisal edges. it has mamelons upon eruptions. this tooth is a a. maxillary central incisor. b. mandibular central incisor. c. mandibular canine. d. maxillary lateral incisor.