If types of flatworms are flukes, tapeworms, and turbellarians, then flukes, tapeworms, and turbell are?

Answer choices:
- major threat to health
 - types of flat leeches
 - Plant growth is reduced
 - types of earthworms
 - competing for resources
 - types of snakes
 - types of flatworms
 - parasites

 

       types of flatworms   