Final answer:
The immune system is not just composed of organs and it is a layered defense system consisting of the innate and adaptive immune systems.
Step-by-step explanation:
The statement that the immune system refers to a specific organ or tissues is False. The immune system is not just composed of organs, but it comprises many biological structures, ranging from individual white blood cells to entire organs, as well as many complex biological processes. The immune system includes a collection of barriers, cells, and soluble proteins that interact and communicate with each other in extraordinary complex ways. It is a layered defense system that consists of two subsystems: the innate immune system and the adaptive immune system.