Answer:
the answer will be 
measure the growth of plant that did not recieve fertilizer
perform additional trials
Explanation:
i just took the test and got the answer right
 
        
                    
             
        
        
        
Ultraviolet is <span>responsible for causing sunburn </span>
        
                    
             
        
        
        
Probably if there are not enough plants in that area
        
             
        
        
        
Some activities that cell requires energy may include cell division, active transport, protein synthesis etc.
In human, Cells get their energy by the food we eat. The nutrients in the food breaks down into soluble and simple molecules in stomach and small intestine and it is absorbed through the small intestine and assimilated into the cells, becoming part of it, providing the uses for each type of nutrient. And of course, many of them is the energy source.