Fact 1: Adult tunicates are barrel-shaped.

Fact 2: Sea squirts are the best known tunicates.

Given the two facts above, answer the question "What are barrel-shaped?" with 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       