Answer: 
The phenomenon seen by the students is Osmosis. 
Explanation:
Osmosis is the movement of molecules from higher concentration to lower concentration through a semi-permeable membrane. This type of movement of molecules occurs in the body cells. When the concentration of molecules is higher outside the cell than the inside, the molecules goes inside the cell through semi-permeable membrane. 
 
        
                    
             
        
        
        
Cholera is caused by the bacterium, Vibrio cholerae and produces CTX (cholera toxin, choleragen)...
        
             
        
        
        
Answer:
Gravity.
Explanation:
Gravity is what causes stuff to fall. It also keeps us on the ground, If there were no gravity, life wouldn’t exist as we know it today. Brainliest please! I need brainlest in order to keep answering questions!!
 
        
             
        
        
        
They are multicellular, heterotrophic, they have no respiratory organs, and their digestion is intracellular!