Adult tunicates are barrel-shaped, and sea squirts are the best known tunicates. Given these facts, what are barrel-shaped among the following options:
- adult giraffes
 - adult sea squirts
 - gastropod shells
 - adult starfish
 - Leptospirosis
 - adult sloths
 - Veins and arteries.
 - the body's largest organ


 

  adult sea squirts       