No it is rare..............
        
             
        
        
        
Answer:
you don't have to worry about replacing them or watering them 
Explanation:
 
        
             
        
        
        
Answer:
pollution doesn't nessairly stay in the atmosphere, it is moved throughout the atmosphere and can be removed by a natural process. 
 
        
             
        
        
        
We all have the same genetic makeup. DNA