Answer:
The correct answer is "respiration".
Explanation:
Cellular respiration is the set of metabolic processes at which the cell obtains energy from nutrients and generates waste products. The cell needs an oxidizing agent in order to obtain energy from nutrients, the most widely used is oxygen. Cellular respiration is a vital process for most organisms, therefore, the depletion of oxygen in the self-contained ecological system most likely occurred from small microorganisms that performed this biological process.
 
        
             
        
        
        
Depression :)......................
        
             
        
        
        
Answer:
it would affect by diseases and deaths of no food
Explanation:
 
        
             
        
        
        
Answer: relieving tonsilitis by Reducing the size of the tonsils thus converting enlarged, unhealthy tonsils to healthy ones.
Explanation:
Tonsils are your first line of defense against illness. They produce white blood cells to help your body fight infection. The tonsils combat bacteria and viruses that enter your body through your mouth. However, tonsils are also vulnerable to infection from these invaders.