Vitamin <span>a class of diverse organic substances that occur in many foods in small amounts and are necessary in trace amounts for the normal metabolic functioning of the body</span>
        
             
        
        
        
A. Bacteria are single-celled.
I think it would be this because humans have way more than one cell, and the other ones are the same as us.
Just guessing
        
                    
             
        
        
        
Mitosis never stops in most of the cells of our body like "Gastrointestinal tract", "that give rise to blood cells" etc.
But, it stops after the death of the body.
Hope this helps!
        
             
        
        
        
It would be scarce during a drought because in order for precipitation to take place evaporation must first occur. If there is to water to be evaporated then precipitation won’t take place