<span>They are experiencing Exponential growth</span>
        
                    
             
        
        
        
C6H12O6+6O2--->6CO2+6H2O+energy
Oxygen(O2) is used to break down glucose(C6H12O6) into energy so the answer is b
 
        
             
        
        
        
This movement from a high concentration area to a low concentration are is called Active transport.
<h3>Active Transport</h3>
Active transport by definition is a process that is characterized by the movement of molecules against a concentration gradient. Additionally, this process requires energy. 
As in the question above, glucose molecules have to be moved across the gut lumen of higher glucose concentration to the intestinal cells of relatively low level of glucose. 
Read more on active transport;
brainly.com/question/18489506
 
        
             
        
        
        
The way that you will easily deduce which one it is is that you'll see the mouth first instead of the anus because of the different ways of development.