Echinoderms use pheromones to communicate with each other.
Ascothoracican barnacles attach to echinoderms or corals.
Corals use pheromones to communicate with each other.
corals use what to communicate with each other

1) Energy
2) pheromones
3) kinetic energy
4) produce light
5) heat produced
6) heat energy
7) Chemical energy
8) sound