You are presented with the question "Marine annelids can make a swimming larvae called what?" and the following answer choices: 
- barnacles
 - survive
 - graptolites
 - epidermal
 - Something to move
 - a trochophore
 - fertile
 - permineralization

Now knowing that 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, choose the best answer.


 

      a trochophore   