The brain and heart are more primitive than those of other reptiles, and the lungs have a single chamber and lack bronchi.
ðə bɹˈeɪn ænd hˈɑːɹt ɑːɹ mˈoːɹ pɹˈɪmᵻtˌɪv ðɐn ðoʊz ʌv ˈʌðɚ ɹˈɛptaɪlz, ænd ðə lˈʌŋz hæv ɐ sˈɪŋɡəl tʃˈeɪmbɚ ænd lˈæk bɹˈɑːŋkaɪ.