Answer:
Fungi indirectly help the fishes by providing digested organic nutrients to their prey insects. 
Explanation:
According to the given information, fishes are predators of insects. These insects feed on dead leaves. The insects are not able to digest the cellulose of dead leaves. Fungi breakdown the dead and decaying leaves and digest the complex molecules such as cellulose into simpler organic nutrients which in turn are consumed by insects. 
If fungi do not decompose the dead leaves, insects would not be able to derive the organic nutrients from them. A shortage of food supply to insects would starve them. Unavailability of prey insects would starve fishes. Thereby, fungi indirectly benefit the fishes to obtain their nutrition from the insect. 
 
        
             
        
        
        
<span>The answer is D. Ocean. Desalination is the process of removing salt and other substances from water. It makes the water safe for animals and plants for irrigation. It can be potable for humans if the desalination had removed the salt and ither substances.</span>
        
                    
             
        
        
        
Plant absorb nitrogen gas from bacteria in the soil
        
                    
             
        
        
        
Answer:
forest fires<em><u>.</u></em>
Explanation:
forest fires are human caused and can destruct the habitat and nutrition of the animals severely