Trading blocs. 
Or Acronyms.
        
             
        
        
        
That was the system that became known as 'Apartheid'.
        
             
        
        
        
 Hi I think it'll helps
The word adam is also used in the Bible as a pronoun, individually as "a human" and in a collective sense as "mankind". Biblical Adam (man, mankind) is created from adamah (earth), and Genesis 1–8 makes considerable play of the bond between them, for Adam is estranged from the earth through his disobedience.
 
 
        
                    
             
        
        
        
Subsistence farming, form of farming in which nearly all of the crops or livestock raised are used to maintain the farmer and the farmer's family, leaving little, if any, surplus for sale or trade. Preindustrial agricultural peoples throughout the world have traditionally practiced subsistence farming<span>.</span>
        
                    
             
        
        
        
I think the answer should be the <span>Mesosphere. It is the lowest solid mantle.
Hope this Helps! :)</span>