❓ คำถาม According to the passage, what was the primary outcome of Robert Paine's experiments with *Pisaster ochraceus*?
- A. A. The starfish increased the population of mussels in the intertidal zone.
- B. B. Removing the starfish reduced species diversity by allowing mussels to dominate.
- C. C. The starfish acted as a habitat modifier, creating space for algae.
- D. D. The experiments proved that all predators are keystone species.