Answer:
A. It is a source of genetic variation
 
        
                    
             
        
        
        
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Extra carbon dioxide in the atmosphere increases the greenhouse effect. More thermal energy is trapped by the atmosphere, causing the planet to become warmer than it would be naturally Explanation: yeah
 
        
             
        
        
        
Metre per second is the unit of speed ..... speed is calculated by dividing distance over the time
        
             
        
        
        
Answer:
this is not science questions it is of maths