C) it regulates what goes in and out of the cell 
Usually the membrane is the organelles that acts like a door. They decide what type of nutrients and molecules go into the cell.
        
                    
             
        
        
        
Answer:
Lack of food, increase in predators, lack of space, too much competition within the population, lack of water
Explanation:
 
        
                    
             
        
        
        
Answer:
Less water. 
Explanation:
If the plant is "drought-resistant" then that should mean less water is required for the plant to perform photosynthesis.