Fact 1: Echinoderms lack a centralized nervous system.

Fact 2: Starfish and sea urchins are also echinoderms.

Given the two facts above, answer the question "What lacks a centralized nervous system?" with the following options: 
- Damaged hearing
 - Pesticides
 - Cats
 - insects
 - Sea urchins
 - barnacles
 - Humans
 - Fish


 

     Sea urchins    