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

Fact 2: Modern echinoderms include starfish and sea urchins.

Given the two facts above, answer the question "How do starfish communicate?" with the following options: 
- huddle together
 - sound
 - interact
 - Vibrates
 - wave in air
 - during the day
 - Decibels
 - Pheromones


 

        Pheromones 