We've been looking at a non-specific immune response, as phagocytes will move in to gobble up all types of invaders. But, how do some organisms become immune to specific diseases? That requires another level of immunity, called the adaptive immune system.
The adaptive immune system is mainly seen in vertebrate organisms. Although, there is some current research that points to some features possibly in invertebrates, like insects.
Use the model below to discover one of the major features of the adaptive immune system: