Final answer:
The subject of this question is Biology at a High School level. In the given text, the question is asking about what should be brought back in terms of water conservation. The answer to this question is human activities. Therefore, the correct option is C) human activities.
Step-by-step explanation:
The subject of this question is Biology and it is at a High School level.
In the context of the given text, the question is asking about what should be brought back in terms of water conservation. The answer to this question is C) human activities. The excerpt mentions consulting conservation biologists on projects related to revision of water infrastructure, and the potential conflicts between human and natural capital. This suggests that bringing back human activities is important in managing water resources.
The keywords for this answer are: Biology, High School, water conservation, human activities.