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The key function of lymph is to carry waste and impurities from the cells. Lymph is a clear fluid that circulates through the lymphatic system, which is an integral part of the immune system. It collects fluid and proteins that leak out of blood vessels, along with waste products, toxins, and pathogens from the tissues. By doing so, lymph helps maintain fluid balance within the body and transports these materials to lymph nodes, where they can be filtered and processed by immune cells.

This function is crucial for the body’s detoxification processes and helps the immune system identify and respond to threats. The other options, while related to bodily functions, do not pertain to the primary role of lymph. For instance, transporting oxygen is a function associated with blood and red blood cells, while circulating blood is the role of the cardiovascular system. Regulating body temperature involves multiple systems, including the integumentary system, but is not a direct function of lymph.