The decomposition of marine plants that depletes dissolved oxygen
        
             
        
        
        
Groundwater is the largest available source of freshwater, followed by lakes, rivers, reservoirs and wetlands. Groundwater refers to all subsurface water.
        
                    
             
        
        
        
Answer in picture below:
Base on the given:
if the line goes down = decrease/bad
if the line goes up = increase/good
<u><em>~Lenvy~</em></u>
 
        
             
        
        
        
Quackery<span> is the promotion of fraudulent or ignorant medical practices. A </span>quack<span> is a "fraudulent or ignorant pretender to medical skill" or</span>"a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications he or she does not possess; a charlatan".