You are presented with the question "What has radial symmetry?" and the following answer choices: 
- peachleaf willow
 - sea urchins
 - humans
 - gastropod shells
 - A Greek letter
 - asymmetry
 - dogs
 - Most plants

Now knowing that adult echinoderms have radial symmetry and sea urchins are echinoderms, in the same family as starfish, choose the best answer.


 

  sea urchins       