Which term describes the body's ability to resist infections and maintain health?

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Immunity is the body's ability to resist infections and stay healthy. The lymphatic system plays a key role in that defense by transporting immune cells, filtering pathogens in lymph nodes, and supporting the body's overall immune response. Among the given terms, the one tied to this protective function is the lymphatic-related option, because it points to the system that reinforces immune defense and infection resistance. The other terms describe lymph production, nutrient transport, or the tissue space between cells, which are not about resisting infection. In standard terms, immunity or the immune system is what describes the body's ability to resist infections, with the lymphatic system being a crucial contributor to that capability.