If you are referring to selection pressure, when the selection pressure decreases, there will be weaker forces of natural selection. The angler fishes without the favourable traits would not be that strongly selected against and vice versa. In some cases such as predation selection pressure, the population of angler fishes in the habitat may increase
        
             
        
        
        
-Headaches, which may be severe and worsen with activity or in the early morning.
-Seizures. People may experience different types of seizures. Certain drugs can help prevent or control them. 
-Personality or memory changes.
-Nausea or vomiting.
-Fatigue.
-Drowsiness.
-Sleep problems.
-Memory problems.
 
        
             
        
        
        
...The origin of life on Earth is a set of paradoxes. In order for life to have gotten started, there must have been a genetic molecule.. something like DNA or RNA—capable of passing along blueprints for making proteins, the workhorse molecules of life.
        
             
        
        
        
The segments of DNA that code for specific traits are called genes
        
                    
             
        
        
        
when an animal eats plants they could be eating the carbon.