Fact 1: Flatworms belong to the phylum Platyhelminthes.

Fact 2: Most of the flatworms are parasitic, although the Turbellaria are free-living in fresh water.

Given the two facts above, answer the question "Phylum Platyhelminthes are mostly what?" with the following options: 
- animals
 - engorged
 - fungi
 - infected
 - parasitic
 - insects
 - huge
 - free living


 

     parasitic    