If ants communicate by leaving chemical trails for other ants to follow, then how do ants communicate to other ants to encourage them to follow?

Answer choices:
- 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  