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Vaccines are effective in preventing disease because they
a. prepare the immune system to recognize and destroy pathogens.
b. combine with pathogens to inactivate them.
c. contain specific B lymphocytes.
d. consist of bacteria that could infect healthy cells

Respuesta :

The answer is  a. Because think of the flu for example. The  flu vaccine is designed to recognize flu pathogens, then from time time if you have the flu, You body will recognize the pathoges and fight the flu. Some people even become immune to the flu.

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