Adult worms go through a major transformation to develop reproductive organs, and marine annelid worms have larvae called trochophores that swim about by means of cilia. Given these facts, marine annelids can make a swimming larvae called what among the following options:
- barnacles
 - survive
 - graptolites
 - epidermal
 - Something to move
 - a trochophore
 - fertile
 - permineralization


 

      a trochophore   