The purpose is to bring about conformity , solidarity, and continuity of particular group or society.
        
                    
             
        
        
        
I believe the answer is: sleep debt
Sleep debt refers to accumulative effect that keep increasing as people keep not getting enough time for proper sleep. Studies show that in the long run, sleep debt would resulted in decreasing overall productivity and the actual effect of repaying sleep debt could only be felt if the debt is paid within one week period.
 
        
             
        
        
        
The correct answer is a conditioned stimulus.
A conditioned stimulus (CS) refers to a previously neutral stimulus, that when repeatedly paired with an unconditioned stimulus (UCS) elicits the same response as the UCS, even in the absence of the UCS. In this example, the CS is Dr.Jones closing the classroom door, because this stimulus by itself elicits a response of anxiety in students. 
        
             
        
        
        
Answer:
The answer is perceptual organisation.
Explanation:
This principle refers to grouping small elements in order to form a complete, meaningful idea. The clearest example is solving a jigsaw puzzle: we may separate all the same coloured pieces into separate groups so that it's easier to visualize the final image. 
Perceptual organisation helps us make sense of reality instead of defining each one of its elements by itself.  
 
        
             
        
        
        
The senate leader is the president pro tempore and house leader is the leader of the house. If both president and Vice President should die, the speaker of the house becomes president. The senate confirms cabinet secretaries, justices and ambassadors