Life on earth began to move from water to land during which period of the geologic time scale?
cenozoic era
precambrian time
paleozoic era
mesozoic era

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?