Answer:
Memory
Step-by-step explanation:
- The two important features that characterize the adaptive immune system are specificity and memory.
- The ability of the adaptive immune system to target specific pathogen and generate a tailored immune response against it is termed as specificity.
- The ability of the adaptive immune system to remember the first exposure to the pathogen and thus, generate a heightened and more rapid immune response against the same pathogen on subsequent exposure is termed as memory.