Answer:
c. um sujeito e um núcleo is correct option in the given problem statement.
 
        
             
        
        
        
I would say it’s emotional support because he is helping him or supporting him when he needs help with his emotions
        
             
        
        
        
Can you be a little more descriptive? Thanks
        
             
        
        
        
Answer:
Option A
Explanation:
The green houses gases concentration increases in the the troposphere layer of the atmosphere due to which the sunrays (IR radiation) reflected back by earth are restricted by the green house gases thereby increasing the temperature of the earth and make the climate warmer. 
Hence, option A is correct
 
        
                    
             
        
        
        
Answer:
Desertification
Explanation:
Drought and leaching leave some parts of Africa without much water, which leads to some portions of the area to turn into a desert, which can prove disastrous for the plants and animals that now find themselves in a completely different habitat.