Avaccine is effective because a vaccine is effective because the vaccine contains the lymphocytes necessary to fight infection the vaccine contains the antibodies necessary to fight infection the secondary response of the adaptive immunity is faster and more efficient than the primary response lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen

the secondary response of the adaptive immunity is faster and more efficient than the primary response

Explanation:

A vaccine works because antigens, molecules that are specific to certain pathogens, are introduced to the body producing antibodies when the immune system recognizes them as external bodies, this generates memory in the immune cells so the second time the body encounters this pathogen again, it will recognize the antigens and generate a faster immune response.

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b) the inside picture would look at a very high temperature in a very low ph