What specific defenses depend on activities of what?

Specific defenses depend on the activities of the adaptive immune system, particularly involving lymphocytes, such as B cells and T cells. B cells are responsible for producing antibodies that target specific antigens, while T cells can directly kill infected cells or help coordinate the immune response. These activities are crucial for the body’s ability to recognize and remember pathogens, leading to long-lasting immunity. This specificity distinguishes adaptive immunity from innate immunity, which provides a more generalized defense against pathogens.