Multiple Choice
Which of the following is the most likely reason that we need to develop a new flu vaccine every year?
A) The flu virus evolves due to negative selection.
B) The flu virus evolves due to positive selection.
C) The vaccine evolves due to negative selection.
D) Humans evolve from year to year.
E) Our immune system degrades over time.
Correct Answer:
Verified
Correct Answer:
Verified
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