You are presented with the question "Echinoderms are resistant to some:" and the following answer choices: 
- starfish
 - enzymes
 - Toxicity
 - pesticide
 - parasites
 - toxins
 - boats
 - chemicals

Now knowing that echinoderms lack a centralized nervous system and from animal experiments, it seems to be a central nervous system toxin, choose the best answer.


 

      toxins   