What system developed in medieval Europe in which knights or vassals served and protected kings or nobles in exchange for land

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?

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?

Lincoln makes a moral argument in lines 39-40.bith his premise and claim can be inferred from the biblical quotations at the beginning and end of paragraph