Which of the following skin functions involves the removal of waste products?

The function of excretion is primarily responsible for the removal of waste products from the body. This process occurs through various means, including sweating and other bodily fluids, which help eliminate substances that the body no longer needs. The skin plays a vital role in this function by acting as a barrier that allows the discharge of waste through sweat glands, ultimately maintaining the body's homeostasis and overall health.

Absorption, on the other hand, refers to the skin's ability to take in substances, such as moisture or certain chemicals, rather than removing waste. Secretion is related to the release of substances like oils and sweat, but it does not specifically focus on waste removal. Protection involves shielding the body from external factors such as pathogens and environmental damage, which is crucial for overall skin health but separate from waste removal. Thus, excretion is the key skin function involved in getting rid of waste products effectively.