Work. Many people were without jobs because of the farming crisis, so they left to the cities to find employment. 
        
                    
             
        
        
        
Secondary source ( I have no exploration but it is that)
        
                    
             
        
        
        
Answer: C) The seasons if the rivers that ran through each empire.
Explanation: All of these civilizations started near a river, if the river were to be removed, then the cilvilization woulden't and can't survive.
 
        
             
        
        
        
The current work aims to study both the peer group and family influence on adolescent behavior. In order to achieve the objective mentioned above, an explanatory model based on Structural Equations Modelling (SEM)was proposed. 
The sample was the group of adolescents that participated in the Portuguese survey of the European study Health Behaviour in School-aged Children (HBSC). 
The Portuguese survey included students from grades 6, 8, and 10 within the public education system, with an average of 14 years old (SD=1.89). The total sample of the HBSC study carried out in 2006 was 4,877; however, with the use of the SEM, 1,238 participants were lost out of the total sample.
Learn more about peer groups at
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