Echinoderms use pheromones to communicate with each other, and all echinoderms are marine and benthic. Given these facts, marine and benthic species use pheromones to what among 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  