Ants communicate with chemicals called pheromones.
Physiologically, ants leave a trail of pheromones, which other ants then follow.
Ants communicate by leaving chemical trails for other ants to follow.
How do ants communicate to other ants to encourage them to follow?

[a] Skywriting
[b] Electrical energy
[c] Using a phone to communicate
[d] Leaving a written communicatio
[e] Something coming from a gland
[f] By wind and rain
[g] Chemical energy
[h] Leaving chemical trails