Fact 1: Adult tunicates are barrel-shaped.

Fact 2: Tunicates differ strongly in appearance between the adult and larva.

Given the two facts above, answer the question "What differ strongly in appearance and are barrel shaped?" with the following options: 
- bears
 - barnacles
 - abdomens
 - oxen
 - Leptospirosis
 - cacti
 - burrs
 - tunicates


 

        tunicates 