Which of the following is a function of pores?

Pores play a significant role in the skin's physiology, particularly in relation to waste management. They are tiny openings on the skin's surface that allow for the excretion of sweat and sebum—substances that help eliminate waste products from the body. When sweat is secreted through these pores, it assists in regulating the skin's moisture levels and helps rid the body of toxins and other metabolic waste.

While other options mention important functions of the skin or body—such as temperature regulation, nutrient absorption, and UV ray filtration—these are not primarily functions of the pores themselves. For example, temperature regulation is mainly the role of sweat glands and the overall skin structure, not directly tied to pore function. Therefore, the correct choice highlights the essential role of pores in the body's waste elimination processes, encompassing both sweat and oil production.