You are presented with the question "How do starfish communicate?" and the following answer choices: 
- huddle together
 - sound
 - interact
 - Vibrates
 - wave in air
 - during the day
 - Decibels
 - Pheromones

Now knowing that echinoderms use pheromones to communicate with each other and modern echinoderms include starfish and sea urchins, choose the best answer.


 

        Pheromones 