You are presented with the question "Starfish use _  to communicate with each other." and the following answer choices: 
- scattered light
 - pheromones
 - heat produced
 - sound
 - waves
 - Chemical energy
 - electricity
 - kinetic energy

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


 

  pheromones       