isaacgarciacastillot isaacgarciacastillot

21-09-2018
Biology

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Why have scientists developed vaccines?

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989girlpower 989girlpower

21-09-2018

Simple. To prevent against disease and other epidemics.

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AiyanaMarie1 AiyanaMarie1

21-09-2018

To combat infectious diseases/ to immunize people to infectious diseases.

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