They are important as pheromones, chemical messenger materials, on which insects depend for communication.
ðeɪ ɑːɹ ɪmpˈoːɹtənt æz fˈɛɹəmˌoʊnz, kˈɛmɪkəl mˈɛsɪndʒɚ mətˈɪɹiəlz, ˌɔn wˌɪtʃ ˈɪnsɛkts dᵻpˈɛnd fɔːɹ kəmjˌuːnɪkˈeɪʃən.