The decline in the overall population of trout and larger fish is because the Insect population has decreased.
<h3>What is a population?</h3>
A population is a group of organisms of the same species living in the same habitat. 
Population of organisms is affected by;
- availability of water
- space 
- food and nutrients 
- predators 
- climate change
Since the population of trout is directly affected by the number of insect species, the decline in the overall population is because the Insect population has decreased.
Learn more about population at: brainly.com/question/746835
 
        
             
        
        
        
C "fatty acids" is your answer
        
             
        
        
        
Its found in the tectum of the dorsal aspect of the midbrain
        
             
        
        
        
<em>adaptive radiation formed many new land plant species</em>