The Toltecs were responsible for establishing a variety of the basics that the rest of their Central Mexicans would follow. However, the Toltecs could not establish the major cities and trading centers that people like the Teotihuacanos and the Aztecs would later establish. 
        
                    
             
        
        
        
Answer:
Aging populations
Explanation:
The industrialized countries are facing a big demographic problem in the past few decades. The problem is the aging population. The living conditions in this countries are the best in the world, so they have high life expectancy, and while that is good, a problem occurs because the birthrates are very low. The birthrates are so low that they can not even simply sustain the same number of the population. This situation leads to fewer and fewer young people, and more and more elderly people, so the population pyramid is becoming wider at the top and narrower at the bottom.
 
        
             
        
        
        
The legislative branch in and of itself cannot borrow money, but it can created legislation that permits the federal government as a whole to borrow money, which of course impacts them as well. 
        
             
        
        
        
A. uneven heating of the air