Final answer:
Detoxification is the body's and brain's natural method for eliminating harmful substances. While inflammation is part of the immune response to injury or infection, detoxification deals specifically with the removal of toxins.
Step-by-step explanation:
The body's and brain's natural way of protecting itself against harmful substances is through a process known as detoxification. Detoxification involves the elimination of toxins and harmful substances from the body. While inflammation can be seen as a protective response to injury or infection, and homeostasis refers to the body’s ability to maintain a stable internal environment, detoxification specifically deals with the removal of toxins and is a crucial part of maintaining overall health and function. Within the context of innate immune response, the body uses various chemical and physical barriers. For example, chemical barriers like tears contain enzymes that can destroy bacteria, thus contributing to the body's first line of defense.
Regarding the options provided in the context of Biology, the answer would be D) Detoxification for its direct involvement in the removal of harmful substances. However, the body has many other defenses such as the skin, immune system cells, and inflammation, which is a part of the innate immune response that can act immediately to an infection, helping to protect the body against bacteria, fungi, and cancerous cells, as well as contributing to homeostasis.