Answer:
tunica media hope this helps
 
        
             
        
        
        
Emperor penguins leave and stay for winter months.
 
        
                    
             
        
        
        
Explanation:
The valence electrons determine the group the elements belong in the periodic table. For example, the element sodium, Na, has a valence electron of one and so it belongs to Group 1 in the periodic table. Another example is Aluminium, Al, which has a valence electron of three and therefore it belongs to Group 3 in the periodic table.