Given the question: You are presented with the question "what adults have radial symmetry?" and the following answer choices: - sea urchins - graptolites - humans - fur seals - barnacles - insects - h2o - gastropod shells Now knowing that adult echinoderms have radial symmetry and starfish and sea urchins are also echinoderms, choose the best answer.
The answer is:
sea urchins