When an ecosystem has a scarce nutrient, that is when there is a nutrient limitation. 
So the answer is C. <span>Nitrogen is typically the limiting nutrient in freshwater environments.
This is because Nitrogen is the "scarce" nutrient </span>
        
             
        
        
        
An organism reacts to changes in its environment. this is called Behavior
        
             
        
        
        
By using universal terms and anatomical position when identifying human body parts, there is very little room for error or confusion as to which part you are referring.
        
                    
             
        
        
        
Answer and Explanation:
The lymph node are the sites for the formation of lymphocytes and monocytes. These are concerned with antibody formation and phagocytosis of foreign materials respectively. In the lymph nodes, bacteria and other harmful materials are removed from lymph.
 
        
             
        
        
        
Answer: 
 The byproducts cause the released of high concentration in the fermentation acids and the deceases in the level pf PH. It basically leads to inhibition of the growth of many bacteria. The toxicity at low PH value of the fermentation acids traditionally defined the uncoupling mechanisms. The fermentation acid are resistant bacteria with low PH and It able to generated the ATP and groe the low PH intracellular.