Answer:
the pancreas and liver i think
 
        
                    
             
        
        
        
I think genetic variation, but i'm not completely sure
 
        
             
        
        
        
Answer:
<em>The correct option is limited food and water resources favored the survival of smaller deer.</em>
Explanation:
The islands where the Key deer lived had limited food and water resources. As migration was not possible for these species because the white-tailed deer had more adaptations as compared to them, hence they had to somehow survive in these areas with limited food and water resources. Limited food resources were the reason that the Key deer could not grow properly and hence evolved to have very little weight. 
 
        
             
        
        
        
Answer:
the first one i think is d
 
        
                    
             
        
        
        
I'm thinking either the first or second answer. Sorry if this doesn't help.<span />