You are presented with the question "what do echinoids use to communicate?" and the following answer choices: 
- light
 - Chemical energy
 - Decibels
 - pheremones
 - writing
 - Energy
 - heat produced
 - language

Now knowing that echinoderms use pheromones to communicate with each other and another group of echinoderms are the echinoids, choose the best answer.


 

    pheremones     