Flatworms are a diverse group living in freshwater and marine habitats. Protonephridia are found in some species of flatworms. This organ is a series of tubes and pumps to get rid of excess water that enters the worm passively from the environment. Which group of flatworms (freshwater or marine) does your group think have the protonephridia system
Protonephridia are made up of many flame cells. Flame cells are specialized excretory cell found in the simplest freshwater invertebrates like flatworms.
