TOEFL Listening: ETS-TOEFL听力机经 - 931BTBN3OS49S9X1P$

What does the professor imply about the relationship between tetrapods and elpistostegids? A. Elpistostegids hunted tetrapods to extinction B. Tetrapods first appeared at the same time as elpistostegids C. Tetrapods competed with elpistostegids for the same food D. Tetrapods did not evolve from elpistostegids