TOEFL Listening: ETS-TOEFL听力机经 - D3XZ17BQ364M183SP$

Why does the professor mention the wolf and rabbit, and the corn root worm and corn plant? A. To show how interactions between animals are different from those between an animal and a plant B. To provide examples of relationship that exhibit negative interactions C. To indicate which organism she is studying in her research project D. To give examples of surprising mutualistic relationships