Question

The pheromones by which ants transmit information are

Answer 1

Do you have this answer, if not I would have to say it is sound signals.

Answer 2

Animal Behavior/Pheromones in ants and bees. One of the many ways in which organisms can communicate with each other is through the use of pheromones. An organism generates and emits these hormonal chemicals in order to relay a message to another member of the same species.