You are presented with the question "How do starfish communicate with each other?" and the following answer choices: 
- huddle together
 - writing
 - during the day
 - pheromones
 - Chemical energy
 - waving their arms
 - Decibels
 - talking

Now knowing that echinoderms use pheromones to communicate with each other and echinoderms are represented by the starfish, choose the best answer.


 

    pheromones     