C. Delirium 
He is getting surgery for his hip and was medicated. The medicine made him delirious, that why it only why he was in the hospital 
 
        
             
        
        
        
The answer should be <span>single quotation marks</span>
        
             
        
        
        
Answer:
Different numbers of neutrons 
 
        
             
        
        
        
Answer take one piece of the squirrels diet away and see if anything has changed, if not give it that part back and take something else. repeat till change happens if nothing happens then change hypothesis 
 
        
             
        
        
        
D
Because most air pollution is caused by the burning of fossil fuels burned in the home