The Brazilian highlands are not in Brazil
        
                    
             
        
        
        
You didn’t give any options but i’m assuming it’s “oxygen”
        
                    
             
        
        
        
In Earth's climate system, positive feedback's tend to amplify changes in the system, and negative feedback's tend to encourage the system against change. Having a positive feedback gives the newest updates and brings the problems on the table, thus changes are always a must when there's proof that suggest there's big problem, but when the feedback is negative, lacking, then there's not pressure for changes, so anyone who has interest in not changing will push for that, thus encouragement of taking no changes. <span />
        
             
        
        
        
Answer:  Religion.
If you google the reason for the conflicts in Southwest Asia you find a variety of answers.  I found this to be the most clearly written:
The conflicts are caused by people who are fighting for religion, land and natural resources. What I mean by people fighting over land is some say that god gave them that land and people are still trying to claim it. With there natural resources such as oil, gas and etc. they want it in order to make money. And to become a better military force. With religion, they fight by saying that there religion is right and the other religion is wrong. We could help by learning about each other religions and explaining it to others. With the land we could as the US let them handle it and not let them caught up in their conflict. In regard of other countries military's we need to be watchful of what they are doing and not step them unless its nessarcry. It is important to learn about their culture. Because to be better prepare in case of war and knowing who you are fighting against.
 
        
                    
             
        
        
        
The answers is B.) Large number of Africans we’re forcibly taken to American during the slave trade .