Which of the following are examples of chemical barriers protecting the body against microorganisms?

The correct choice highlights the role of tears and saliva as examples of chemical barriers that protect the body against microorganisms. These fluids contain enzymes, such as lysozyme in tears and antimicrobial peptides in saliva, that actively neutralize and destroy bacteria and other pathogens. By providing enzymatic action and creating an environment that is hostile to microbial growth, tears and saliva help to prevent infections in areas such as the eyes and oral cavity.

Other options include components like skin and mucus, which serve as physical barriers rather than strictly chemical ones. Bile and urine also play roles in flushing out pathogens, but they are not primary examples of chemical barriers. Moreover, fever and inflammation are responses to infection and are part of the immune response rather than barriers that protect against microorganisms. Thus, the focus on tears and saliva illustrates their specific function in the chemical defense mechanism of the immune system.