hˈɛns, mˈɛni spˈiːsiːz hæv dɪvˈɛləpt ˌædæptˈeɪʃənz tə pɹɪvˈɛnt ðɪs dɹˈaɪɪŋ ˈaʊt, sˈʌtʃ ɐz ðə pɹədˈʌkʃən ʌv mjˈuːkəs lˈeɪɚz ænd ʃˈɛlz.
Hence, many species have developed adaptations to prevent this drying out, such as the production of mucous layers and shells.