❓ Câu hỏi According to the passage, what is the primary reason the starfish Pisaster ochraceus is considered a keystone species?
- A. It is the most abundant species in the intertidal zone.
- B. Its removal leads to a dramatic decrease in mussel populations.
- C. It has a large effect on community diversity despite its low abundance.
- D. It serves as a habitat for many other marine organisms.