They are Nucleic Acids, Proteins, Carbohydrates, and Lipids
        
             
        
        
        
A population consists of all the organisms of a given species that live in a particular area
        
             
        
        
        
Answer:
An arthropod is an invertebrate animal having an exoskeleton like a crab and a centipede.
 
        
                    
             
        
        
        
Body organs can be interrelated with other organisms since they are somehow morphologically and physiologically the same. 
1. Brain, the brain for most animals are the same, serves the function the same and acts for the many functions of an organism, similarly. This vital organ plays on action-response behavior, management and primal survival instinct, although somehow it's different in structure from the other organisms. 
2. Stomach, is an organ wherein the food that is taken in from mouth or opening of a cavity is stored for a short time and is prepared for digestion and metabolic process in the digestive tract or G.I. tract.