❓ 题目 According to the passage, what was the main finding of Robert Paine's experiments with starfish in the Pacific Northwest?
- A. A) The removal of starfish caused an increase in overall species diversity.
- B. B) The presence of starfish was essential for maintaining high species diversity.
- C. C) Physical factors were the primary determinants of community structure.
- D. D) Mussels were able to coexist with other species without predation pressure.