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It is any of the perceptually distinct units of sound in a specified language that distinguish one word from another, for example p, b, d, and t in the English words pad, pat, bad, and bat.
Pheromone is the chemical subtance left by an ant while searching for a food. This substance leed ants to follow the path.
However, phoneme is the abstract sound in a specific language. I don't think the question is about phoneme. there is no relation betweel phoneme and ant at all.