You are presented with the question "what lack a centralized nervous system?" and the following answer choices: 
- Pesticides
 - neurons
 - barnacles
 - alpacas
 - insects
 - fish
 - humans
 - starfish

Now knowing that echinoderms lack a centralized nervous system and starfish and sea urchins are also echinoderms, choose the best answer.


 

        starfish 