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Ants recognize their friends because they have strong ability to smell. They know each others smell. The smell is of a hormone released by ants called Pheromone.
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Ants recognise its friends by its ability to smell.ants communicate each other or recognise by its pheromones,sounds and touch.they use pheromones as chemical signals.ants percieve smell by its long, thin and mobile antennae

hope this helps u
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