alleryStart learning →Flu vaccines must be updated every year because flu viruses:
AAre not really alive
BLack any genes at all
CEvolve very quickly
DNever change at all
Answer & Solution
Correct answer: C. Evolve very quickly
1. They mutate and replicate fast.
2. Flu viruses evolve very quickly.
3. Last year's vaccine may not protect.
_Source: OpenStax Biology 2e, Chapter 19, The Evolution of Populations (CC BY 4.0)._
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