Tadpoles have cartilaginous skeletons, gills for respiration (external gills at first, internal gills later), lateral line systems and large tails that they use for swimming.
tˈædpoʊlz hæv kˌɑːɹɾɪlˈædʒɪnəs skˈɛlᵻtənz, ɡˈɪlz fɔːɹ ɹˌɛspᵻɹˈeɪʃən ɛkstˈɜːnəl ɡˈɪlz æt fˈɜːst, ɪntˈɜːnəl ɡˈɪlz lˈeɪɾɚ, lˈæɾɚɹəl lˈaɪn sˈɪstəmz ænd lˈɑːɹdʒ tˈeɪlz ðæt ðeɪ jˈuːz fɔːɹ swˈɪmɪŋ.