TOEFL Listening: ETS-TOEFL听力机经 - J2Z2GSM453L2USK4P$

Why does the professor mention the soil in the forests of Southeastern Asia? A. To suggest that Nepenthes plants are not native to that region B. To explain why Nepenthes plants need to trap insects C. To illustrate a difference between Nepenthes and other carnivorous plants D. To provide an explanation for the different shapes and sizes of Nepenthes species