Ants communicate with chemicals called pheromones, and physiologically, ants leave a trail of pheromones, which other ants then follow. Given these facts, how do ants communicate to other ants to encourage them to follow among the following options:
- Skywriting
 - Electrical energy
 - Using a phone to communicate
 - Leaving a written communicatio
 - Something coming from a gland
 - By wind and rain
 - Chemical energy
 - Leaving chemical trails


 

        Leaving chemical trails 