You are presented with the question "what uses pheromones to communicate with each other?" and the following answer choices: 
- starfish
 - bees
 - bacteria
 - honeybees
 - density
 - humans
 - h2o
 - insects

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


 

 starfish        