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

Fact 2: Starfish and sea urchins are also echinoderms.

Given the two facts above, answer the question "what uses pheromones to communicate with each other?" with the following options: 
- starfish
 - bees
 - bacteria
 - honeybees
 - density
 - humans
 - h2o
 - insects


 

 starfish        