TOEFL Reading: ETS-TOEFL阅读机经 - 7ZQ7UP40P3J47PKBL$

According to paragraph 6, which of the following is an effect of the activity of damselfish on the reef environment? A. Encrusting corals dominate in damselfish territories. B. The damselfish attract many species of grazers. C. Algae grow rapidly. D. Algal diversity is greater than in other parts of the reef.