If marine annelids go through a major transformation to be able to make larvae called trochophores that swim about by means of cilia, then marine annelids can make a swimming larvae called what?

Answer choices:
- barnacles
 - survive
 - graptolites
 - epidermal
 - Something to move
 - a trochophore
 - fertile
 - permineralization

 

      a trochophore    