Which of the following is a benefit of ecosystem services?

The benefit of ecosystem services includes various natural processes and functions that contribute to human well-being and environmental health. One significant example of this is water purification. Ecosystem services such as wetlands, forests, and riparian zones help filter pollutants from water, regulate its flow, and maintain water quality.

These natural systems operate by trapping sediments, removing excess nutrients, and breaking down contaminants, which is essential for providing clean drinking water and supporting aquatic life. The role of ecosystems in water purification not only aids in maintaining healthy environments but also reduces the costs associated with water treatment for human use.

In contrast, the other options do not accurately represent the benefits of ecosystem services. While regulation of human activities might relate to ecosystems, it typically pertains to policies and governance rather than a direct benefit derived from ecosystem processes. Permanent availability of resources is not guaranteed because ecosystems can be degraded or altered by human actions. Lastly, the concept of ecosystem services encompasses a wide range of benefits, including ecological and social advantages, not just financial ones.