Answer:
false is right answer for your question
 
        
                    
             
        
        
        
I swear it's the cell membrane.. I'm not sure though
        
                    
             
        
        
        
The three main worm phyla are flatworms, roundworms, and segmented worms. Roundworms have a digestive tube that has two openings. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels. These are important steps in the evolutionary development of animals.