Fact 1: Ants communicate with chemicals called pheromones.

Fact 2: Pheromones are only found in insects.

Given the two facts above, answer the question " insects communicate with what" with the following options: 
- wave in air
 - chemicals
 - Vibrates
 - Decibels
 - waves
 - speech
 - whistling
 - hand signals


 

  chemicals       