Fact 1: Ants communicate with chemicals called pheromones.

Fact 2: Ants use receptors on their antennae to follow recruitment pheromone trails.

Given the two facts above, answer the question "Some insects communicate with what detected by their antennae?" with the following options: 
- chemicals
 - sound
 - microwaves
 - radio waves
 - flash cards
 - Decibels
 - wave in air
 - Vibrates


 

 chemicals        