A flu shot consists of a vaccine against several strains of influenza virus. This year, you get the shot and "the flu." What happened? (There are at least three explanations.)

Going for a check up and taking the appropriate medication.

Explanation:

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.