Answer:
The force of surface tension in the lungs is so great that without something to reduce the surface tension, the airways would collapse after exhalation, making re-inflation during inhalation much more difficult and less effective. Collapse of the lungs is called alectasis.
Explanation:
 
        
             
        
        
        
<span>The liver is the largest of the human body<span>.
(</span></span><span>the skin. It weighs between 3 <span>and 4 kg)</span></span>
        
             
        
        
        
Answer:
answer should be "making water hypoxic for organisms". reason is because the runoff from these treatment plants are filled with nutrients, which will cause eutrophication. eutrophication is excessive algae sprouts which create more DO but then later becomes all used up when they decompose, making it so other organisms have no oxygen.