You are presented with the question "What kind of animal doesn't have a respiratory or excretory system?" and the following answer choices: 
- a fish
 - bears
 - ant
 - whale
 - humans
 - starfish
 - mammals
 - llama

Now knowing that echinoderms lack respiratory and excretory systems and starfish and sea urchins are also echinoderms, choose the best answer.


 

      starfish   