Answer:
They haven't yet, that is a myth. Rattlesnakes still have a rattle and probably always will.
Explanation:
 
        
                    
             
        
        
        
Answer: the expression of certain genes is affected by temperature
Explanation:
For organisms to survive changing environmental conditions, a lot of molecular processes occur in the genes. 
For the arctic fox, enzymes coded by specific genes are periodically "switched on or off" depending on the temperature. 
Thus, the change in colour can be EXPLAINED by the expression of certain genes affected by temperature
 
        
             
        
        
        
Dominant is more stronger then Ressesive 
<em>ex</em><em>:</em><em> </em><em>if</em><em> </em><em>mom</em><em> </em><em>has</em><em> </em><em>brown</em><em> </em><em>hair</em><em> </em><em>and</em><em> </em><em>dad</em><em> </em><em>has</em><em> </em><em>blond</em><em> </em><em>the</em><em> </em><em>brown </em><em>hair</em><em> </em><em>will</em><em> </em><em>be</em><em> </em><em>more </em><em>dom</em><em>inant</em><em> </em><em>bec</em><em>ause</em><em> </em><em>it's </em><em>a</em><em> </em><em>stron</em><em>ger</em><em> </em><em>gene</em>
 
        
                    
             
        
        
        
Mitosis is the process by which the nucleus of a cell divides to form two new nuclei?
 
        
             
        
        
        
A cell membrane is compared to a window screen because of its translucent properties. Like it allows oxygen to come through or it resists invader who tries to come into the cell.
Your answer is Cell membrane.