Which of the following is an example of a non-human resource?

The correct answer identifies trees as an example of a non-human resource. Non-human resources refer to natural resources or materials that are not created or managed by humans but are essential for various processes, both in nature and in human activities. Trees fall under this category as they are a renewable natural resource that provides timber, paper, oxygen, and habitat for wildlife, among other benefits.

In contrast, parents, while valuable and essential in a family context, are considered human resources as they contribute to human capital and social structures. Knowledge is also a human resource, as it pertains to the skills and information that individuals carry, and it can be improved or increased through human effort and learning. Energy, while it can come from natural sources like fossil fuels or renewables, is not classified as a non-human resource in this context because it typically requires human technology and infrastructure for extraction, conversion, and usage. Thus, trees represent a clear example of non-human resources within the scope of resource management.