the answer is: A cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. 
Here the requirement for research with human subjects according to the Fed :
"Obtains information or biospecimens through intervention or interaction with the individual, and uses, studies, or analyzes the information or biospecimens; or Obtains, uses, studies, analyzes, or generates identifiable private information or identifiable biospecimens."
The experiment on this ption fulfill the criteria because:
- The experiment should use studies or analytics to obtain some sort of private information from the subjects.  (such as their mood)
- The experiment should make some sort of intervention that can be used to measure its hypothesis. (in the case above, the researchers could put the subject under a certain level of stress before telling them to  solve a set of problems)
- The researchers need to interact with the subject in a certain way. (since the researchers meet the undergraduate directly, it's considered as an interraction)
 
        
             
        
        
        
<span>Albrecht Durer, the greatest master of the Northern Renaissance. ... The God-like pose with the right hand raised (as if in blessing) and the ringlets of the hair always remind me of The Salvator Mundi painting of 1513, (attributed to Leonardo da Vinci). In 1500 the full frontal pose was associated with images of Chris</span>
        
             
        
        
        
Answer: All the the above 
Explanation:
 
        
                    
             
        
        
        
Answer:
Explanation:
Most of the people can elect leaders and petition the government. ... How is the principle of "rule of law" evident in the Constitution? It creates a government that can make, enforce, and review its own laws
 
        
                    
             
        
        
        
Answer:
The practice of human sacrifice
Explanation:
"Aztec, self-name Culhua-Mexica, Nahuatl-speaking people who in the 15th and early 16th centuries ruled a large empire in what is now central and southern Mexico. ... The Aztecs referred to themselves as Culhua-Mexica, to link themselves with Colhuacán, the center of the most civilized people of the Valley of Mexico."
( my evidence to prove that)