Fact 1: Adult worms go through a major transformation to develop reproductive organs.

Fact 2: Marine annelid worms have larvae called trochophores that swim about by means of cilia.

Given the two facts above, answer the question "Marine annelids can make a swimming larvae called what?" with the following options: 
- barnacles
 - survive
 - graptolites
 - epidermal
 - Something to move
 - a trochophore
 - fertile
 - permineralization


 

      a trochophore   