Echinoderms lack a centralized nervous system, and another group of echinoderms are the echinoids. Given these facts, what do echinoids lack among the following options:
- characteristics
 - centralized nervous system
 - permineralization
 - the body's largest organ
 - biological diversity
 - that material's properties
 - aerobic capacity
 - organic matter


 

  centralized nervous system       