Fact 1: Ants communicate with chemicals called pheromones.

Fact 2: Ants communicate with the colony in the form of what is called pheremon trails.

Given the two facts above, answer the question "What do ants use to communicate with the colony?" with the following options: 
- radio
 - heat energy
 - calls
 - Chemical energy
 - sound
 - pheremones
 - nerves
 - singing


 

      pheremones   