I think the answer to this is D. 
        
                    
             
        
        
        
Genetic applications in medicine can include studies of inheritance, mapping disease genes, diagnosis and treatment, and genetic counseling.
 
        
             
        
        
        
The answer is that both devices are a type of simple machine called a wedge. A wedge is just one of six types of simple machines. The others are the inclined plane, screw, lever, wheel and axle, and pulley