pick from the following.
(1). immunological memory
(2). failed memories
(3). resistance
(4). broken memory
(5). major threat to health
(6). resistance activities
(7). Leptospirosis
(8). sad memories
Q: Fact 1: Active immunity results when an immune response to a pathogen produces memory cells. Fact 2: Memory cells are the basis of immunological memory. Given the two facts above, active immunity results when an immune response to a pathogen produces the basis of what?
A:
(1).