You are presented with the quiz "How do ants communicate to other ants to encourage them to follow?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ants communicate with chemicals called pheromones" and "physiologically, ants leave a trail of pheromones, which other ants then follow". 

So, what's the best answer to the question?


 

        Leaving chemical trails   