I believe animals that possess homologous structures probably  evolved from the same ancestor. Homologous structures are similar because of common ancestry.  A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from  a common ancestor. 
        
             
        
        
        
Outer core is the answer - Appex
 
        
             
        
        
        
The answer is D. The offspring will have no genetic differences from their parents.