TOEFL Listening: TPO-TOEFL阅读TPO - 35353KB5T25L4SY2N$

According to paragraph 4, why is the question of ecosystem stability complicated? A. The reasons for ecosystem change are not always clear. B. Ecologists often confuse the word "stability" with the word "resilience." C. The exact meaning of the word "stability" is debated by ecologists. D. There are many different answers to ecological questions.