I have encountered this question before, and the given diagram shows no producers. Moreover, it consists of pictures of five organisms, with no relationship being shown between them. Therefore, in order to make the model more accurate, Maria should add B. The sun and arrows to show the flow of energy.
 
        
                    
             
        
        
        
Enzymes speed up a biological reactions by lowering the activation energy. 
Hope it helped you, and have a great day!
-Charlie 
Thank you so much!!!!!!!!
        
                    
             
        
        
        
Can you please show the answer choices to pick from?
        
             
        
        
        
In plants life cycle, the diploid stage is known as B. The sporophyte.