You are presented with the quiz "Phylum Platyhelminthes are mostly what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "flatworms belong to the phylum Platyhelminthes" and "most of the flatworms are parasitic, although the Turbellaria are free-living in fresh water". 

So, what's the best answer to the question?


 

     parasitic      