Fact 1: Echinoderms use pheromones to communicate with each other.

Fact 2: Echinoderms and molluscs use adhesives to grip the substrate during locomotion.

Given the two facts above, answer the question "What do echinoderms employ to grip surfaces?" with the following options: 
- adhesives
 - resistance
 - Hemoglobin
 - properties
 - forces
 - direct energy
 - abrasion
 - layers of fat


 

 adhesives        