Our life is like a german confederacy, made up of petty states, with its boundary forever fluctuating, so that even a german cannot tell you how it is bounded at any why is this quote an example of simile?

Atherapist at a free university clinic treats elementary school children with behavior problems who are referred by a social service agency. she is also a doctoral candidate who proposes using data she has and will collect about the children for a case-based research project. describe the type of parental permission which is required in this case?