Question

multiple - choice question
how do vaccines provide immunity?
by providing an extra physical barrier of protection around our cells to make it so that pathogens cannot get into our body
by triggering the immune system to produce antibodies and memory cells against a pathogen without having to be fully exposed
by changing the temperature of the body so that pathogens can no longer survive
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Explanation:

Vaccines introduce weakened or inactivated pathogens or their components. This triggers the immune system to produce antibodies and memory cells for future protection.

Answer:

By triggering the immune system to produce antibodies and memory cells against a pathogen without having to be fully exposed