Final answer:
The vertebrate innate immunity includes physical and chemical barriers that provide a nonspecific first line of defense against pathogens. This system does not require previous exposure to the pathogen and provides a general and rapid response.
Step-by-step explanation:
The vertebrate innate immunity includes the first line of defense against pathogens and does not require previous exposure to the pathogen. It is nonspecific and relies on physical and chemical barriers, such as the skin, mucous membranes, and various secretions, like tears and mucus, that contain microbicidal factors. This system also includes the second line of defense, which involves chemical signals that produce inflammation and fever responses, as well as mobilizing protective cells and other chemical defenses.
Overall, the innate immune system provides a general and rapid response to pathogens, but it does not have the ability to specifically recognize and remember specific pathogens.