I think BO or B, but BO has more chance.
        
             
        
        
        
I believe the answer is Gene splicing because they remove specific genes in order to create a transgenic organism.
I hope this helps!
 
        
                    
             
        
        
        
Answer:
I think It's D
Explanation:
If it's not D then it's B
 
        
                    
             
        
        
        
The general theory is that mitochondria and chloroplasts began initially as separate cells that were "eaten" by larger cells, but not digested and simply passed on due to their advantages.<span />