The answer is called respiration. Hope this helps.
        
             
        
        
        
I think it's D. Sry if you get it wrong though
        
             
        
        
        
Answer:
I think the answer may be D for you because for me the correct answer was “more thriving fish in the area” I’m so sorry if that isn’t the correct answer though
Explanation:
 
        
             
        
        
        
Enzymes acts as a catalyst in chemical reactions to speed up the rate of reaction.
Enzymes are not necessarily needed because substrates can disintegrate on their own, but enzymes are helpful to aid this process.