The answer to this question is Gene 
        
             
        
        
        
<span>peristalsis should be your answer.</span>
        
                    
             
        
        
        
The warming of said environment or planet. by emitting carbon and other gasses that create a thin layer of different gasses that trap the heat from the suns rays and breaks down the ozone layer.
        
             
        
        
        
Answer:
true
Explanation:
you frequently need a control which shows the experiments to stay the same. controls are very important.