Remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species.
        
                    
             
        
        
        
They are both made up of monomers called nucleotides. 
 
        
                    
             
        
        
        
Chloroplasts (they are only present in plants)
        
             
        
        
        
<span>I think you might be asking about the 3 different osmotic conditions a cell might find itself in.  Isotonic is the normal cell environment where water moves in and out of the cell freely and equally in both directions.  It is in osmotic equilibrium so to speak.  The concentration of water and solutes is equal on both sides of the cello membrane.  In a hypotonic solution the cell will gain water and swell up -...</span>