You are presented with the question "What are barrel-shaped?" and the following answer choices: 
- adult giraffes
 - adult sea squirts
 - gastropod shells
 - adult starfish
 - Leptospirosis
 - adult sloths
 - Veins and arteries.
 - the body's largest organ

Now knowing that adult tunicates are barrel-shaped and sea squirts are the best known tunicates, choose the best answer.


 

  adult sea squirts       