Answer:
C
Explanation:
The helix has to unwind before separating. Once it's separated, then new bases can be added. Once the bases are added, the separate strands wind into helices.
 
        
                    
             
        
        
        
<span>they have fossils and pieces of the environment from the past inside of them</span>
        
                    
             
        
        
        
Answer:
pluto 
Explanation:
the others are formed from other things 
 
        
                    
             
        
        
        
The photoreceptors would be your eyes, chemoreceptors skin, olfactory for nose and mechanoreceptors for obviously tongue hope this helps.
 
        
                    
             
        
        
        
A common human, they go from an embryo then develop into an infant then grow to a teen. once a teen they might go through changes... 
a plant is also evidence, they develope from a seed to a small bud and grow to a small plant.