Fact 1: Echinoderms lack a centralized nervous system.

Fact 2: Echinoderms are represented by the starfish.

Given the two facts above, answer the question "What kind of animal doesn't have a centralized nervous system?" with the following options: 
- dog
 - mammals
 - cows
 - bird
 - human
 - elephants
 - starfish
 - a fish


 

       starfish  