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

Fact 2: Echinoderms are represented by the starfish.

Given the two facts above, answer the question "How do starfish communicate with each other?" with the following options: 
- huddle together
 - writing
 - during the day
 - pheromones
 - Chemical energy
 - waving their arms
 - Decibels
 - talking


 

    pheromones     