Adult worms go through a major transformation to develop reproductive organs, and marine flatworms belong to a major group of worms called the Platyhelminthes. Given these facts, when do platyhelminthes reproductive organs develop among the following options:
- when they become adults
 - It helps them survive
 - produce offspring
 - By wind and rain
 - during the day
 - members of their own species
 - an area swollen with pus
 - Something coming from a gland


 

 when they become adults        