DNA is the genetic composition of the cells in the human body, think of it as the coding for a computer but for cells. These carry your genetic composition (blue eyes, Brown hair, tall, short blah blah blah) and traits like smart, funny, shy.
Hope that helps.
        
             
        
        
        
The answer is B I'm pretty sure of it.
        
                    
             
        
        
        
There are sometimes similarities in the embryonic stages of organisms that do not exist in the adult stages.
 
        
                    
             
        
        
        
The correct answer should be the Periderm.
It is not as simple as this, of course and you would be wise to know that periderm is just a part of the overall concept that is bark, because bark is not a biological term.