Answered

Your friend Joe made the following statement: "People who were vaccinated for the flu last year do not need to be vaccinated again this year."
Based on what you know about viruses, you do not agree. Which scientific idea provides the evidence to argue his statement?
A. Vaccines trigger the production of antibodies.
B. Strains of the flu virus evolve quickly.
c. Antibodies bind to and neutralize the flu virus.