Natural selection is the process in nature by which organisms better adapted to their environment tend to survive and reproduce more than those less adapted to their environment. For example, treefrogs are sometimes eaten by snakes and birds.
 
        
             
        
        
        
Answer:
3rd One
Explanation:
1. Doesn't even talking about animals dying
2. Kills of all the fish in one small pond but not the whole species
3. Correct because every individual in a species has been killed 
4. They just migrated not died
 
        
                    
             
        
        
        
Answer:
Over-straining yourself or changing workouts routines
Explanation:
 
        
                    
             
        
        
        
Answer:
THE RELATIONSHIP OF IDENTIFICATION TO BACTERIAL CLASSIFICATION AND NOMENCLATURE. In order to identify an unknown bacterial isolate, the characteristics of the isolate must be compared to known taxa. In microbiology, the basic taxonomic unit is the species, and groups of related species are placed in the same genus.