❓ 题目 According to the passage, which of the following is a reason why the Anthropocene lacks a universally accepted boundary?
- A. A. There is no evidence of human influence on geological formations before the Industrial Revolution.
- B. B. Scientists cannot agree on a single global marker that clearly separates it from the Holocene.
- C. C. The term Anthropocene has not been accepted by any scientific organization.
- D. D. Human activities have not yet caused any permanent changes to the Earth's systems.