11 Which of the following is not a characteristic of the adaptive immune system? a. It is specific for a given organ. b. It is antigen-specific. c. It has memory. d. It is systemic.

The correct answer is a. It is specific for a given organ. The adaptive immune system is not specific for a given organ; rather, it is a systemic response that involves the activation of immune cells and the production of antibodies to target and eliminate specific pathogens or foreign substances in the body.