Fact 1: Ants communicate with chemicals called pheromones.

Fact 2: Pheromones are stinky chemicals excreted from glands throughout the ants body.

Given the two facts above, answer the question "Ants communicate via" with the following options: 
- mechanical waves
 - telepathy
 - radio waves
 - radiative transfer
 - electrically
 - excreted chemicals
 - sensory neurons
 - during the day


 

      excreted chemicals   