TOEFL Listening: ETS-TOEFL听力机经 - 33R5E_6UNUF9FQI1P$

Why does the professor discuss the function of pollen? A. To describe the reproductive process is some plants B. To showwhy pollen does not decay as rapidly as other parts of plants C. To explain why pollen can be an unreliable source for archaeologists D. To illustrate why archaeologists find more pollen than phytoliths in soil