Final answer:
Active immunity is produced by the body in response to an antigen, providing long-term protection and immunological memory.
Explanation:
Active immunity is immunity that is produced by the body itself in response to an antigen, either through infection or vaccination. An example of active immunity is when the body develops immunity to a virus after being exposed to it naturally or through a vaccine.
On the other hand, passive immunity involves the transfer of antibodies from an external source, such as a mother to a fetus or through injections. Active immunity provides long-term protection and immunological memory, while passive immunity offers immediate but temporary protection.
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