Flatworms belong to the phylum Platyhelminthes, and parasitic flatworms have evolved a close association with their hosts. Given these facts, organisms belonging to the phylum Platyhelminthes have evolved a close association with their what among the following options:
- ovaries
 - Wasps
 - life
 - plant
 - orchids
 - hosts
 - root system
 - tree host


 

      hosts   