TOEFL Listening: TPO-TOEFL阅读TPO - 4451F3J2J5A6GV4PN$

Paragraph 5 supports which of the following statements regarding the importance of fires in maintaining savannas? A. Fires prevent the growth of pyrophytes. B. Fires eliminate some species and thus reduce the overall diversity of the ecosystem. C. Fires that occur once every two years are unlikely to help maintain savannas. D. Fires prevent some species from eliminating other species with which they compete.