I believe the most VALID answer to your question is "Homeostasis". 
 Organisms that carry out homeostasis do so in order to maintain a constant, optimum environment for the cells within their body. 
 
        
             
        
        
        
Answer: insulin 
Explanation:
Ur pancreas makes it to lower blood glucose or sugar 
 
        
             
        
        
        
Answer:
Sherlock Holmes
Explanation:
He was the inspiration. Not the actual Holmes. 
 
        
                    
             
        
        
        
Because of human-driven increased levels of carbon dioxide in the atmosphere, there is more CO2 dissolving into the ocean. The ocean's average pH is now around 8.1 , which is basic (or alkaline), but as the ocean continues to absorb more CO2, the pH decreases and the ocean becomes more acidic.
        
             
        
        
        
We would need more details. Do you need to follow a rubric? Do you have any specific rules? Exactly what about global warming? How long of an essay? What’s the minimum and maximum about of pages. Is this typed, or written? Is there any specific information you’ve learned this unit that you need to include?