I think the circulatory system is the best body system because we need the heart to stay alive, many people live with only one lung. but we need the respiratory system to let oxygen in, and let carbon dioxide out.
        
             
        
        
        
The regular recommendation of many health professionals are to drink 8-10 glasses of water daily however, this is dependent on the activity the person is engaging in and the climate the person is engrossed to. For example, when an athlete has ran possibly n kms. it might be a necessity for a person to drink water since the body processed much faster than normal. 
        
                    
             
        
        
        
Answer:
Explanation:
the energy needed to raise the temperature of 1 kilogram of water through 1 °C, equal to one thousand small calories and often used to measure the energy value of foods.
 
        
                    
             
        
        
        
You should change it out (try out a new method so that you get something that will work).
 
        
             
        
        
        
After one month, a death certificate must be signed to confirm the death.