The answer is c because the precession of the ecliptic was component of a milankovitch cycle  and is related to periodic ice ages through out history
 
        
                    
             
        
        
        
The functions that both the nerve cells and muscle cells
have in common are the following;
-         
Both cells are excitable
-         
They both experience voltage difference in the
cell membrane
-         
The cell membrane of both of cells has electrochemical
impulses
 
        
             
        
        
        
Answer:
the part which allows the pollen is the stigma
 
        
             
        
        
        
the state of having the same or similar relation, relative position, or structure