Final answer:
T cells are not part of the adaptive immune system.
Step-by-step explanation:
The component of the innate immune system that is not part of the adaptive immune system is a) T cells.
T cells are part of the adaptive immune system, while macrophages, natural killer cells, and B cells are components of the innate immune system. T cells are responsible for cell-mediated immunity and play a crucial role in coordinating the immune response. They identify and destroy infected cells, recognize specific antigens, and activate other immune cells.