They convert energy from food into energy the cell can use - Answer
        
             
        
        
        
Answer:
Due to less steps and requires less energy.
Explanation:
The bacterial cell is able to use glucose first as an energy source then switch to lactose because glucose requires less steps and less amount of energy for the break down as compared to lactose. If lactose is the only sugar available to the bacterial cells, then bacterial cells will use it as energy source for the production of energy. In order to use lactose, the bacteria must express the lac operon genes, which encode the main enzymes for lactose uptake and metabolism.
 
        
             
        
        
        
Answer:
because plants faces and gets sunlight to grow 
 
        
                    
             
        
        
        
Animals need other organisms to survive and plants only need sunlight and water