❓ Câu hỏi According to the passage, what is the primary reason hydras do not show signs of aging?
- A. A) They reproduce asexually through budding, which resets their cellular age.
- B. B) They have a constant supply of active stem cells that replace old tissues.
- C. C) They are immune to predators and environmental stress in their natural habitat.
- D. D) They possess a unique gene that completely prevents all DNA mutations.