The answer is probably air.
        
             
        
        
        
The DNA copies are moved to opposite ends of the cell.
        
                    
             
        
        
        
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
 
        
             
        
        
        
They prove that it is impossible for all scientists to accept the same theory.
Scientists are always coming up with new theories, and there will always be people out there to disagree with them.