Roundworms

1. All roundworms are parasites. 
2.  They multiply quickly.
3.   They are more complex than flatworms.
4.  They have two openings. 
5.   They can get inside you if you walk barefoot.
6.  They can get inside you if you eat raw meat.  
7. roundworms affect many animals.  
8. round worms probably came from flatworms.  
9. some are adapted to the water.   

this is the roundworm cycle.