An irregularly occurring and complex series of climatic changes affecting the equatorial pacific region and beyond every few years, characterized by the appearance of unusually warm, nutrient-poor water off northern Peru and Ecuador, typically in late December
        
             
        
        
        
Answer:
down syndrome
Explanation:
people with down syndrome have an extra chromosome in the twenty-first pair
 
        
                    
             
        
        
        
By experimenting
hope this helps!!!
        
             
        
        
        
Answer:
x= 33
Explanation:
distribute then multiply then add then divide