contribution is the answer 
 
        
                    
             
        
        
        
Answer:
False.
Explanation:
It is just a regular mutation.
 
        
                    
             
        
        
        
Answer:
a website with .edu .gov or a book written by a famous professsor or scientist
Explanation:
 
        
             
        
        
        
D 
Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.
        
             
        
        
        
Answer:
B 
(The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. This is why DNA replication is described as semi-conservative, half of the chain is part of the original DNA molecule, half is brand new.)