The answer to your question 12
 
        
                    
             
        
        
        
First is the second and the other one is the 4th 
        
             
        
        
        
Harmful because they change how the genes are supposed to form and they can give disorders at times. 
        
             
        
        
        
Yes, the pterosaurs is the ancestor of the bird. 
        
                    
             
        
        
        
Answer:
glucose is missing in the following equation