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

Fact 2: All echinoderms are marine and benthic.

Given the two facts above, answer the question "marine and benthic species use pheromones to what?" with the following options: 
- seed dispersal
 - produce offspring
 - life-sustaining
 - float underwater
 - defense mechanism
 - arm each other
 - communicate with each other
 - live in marine bays


 

       communicate with each other  