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Alchen [17]
3 years ago
15

Why do we have to get the flu shot every year ?

Biology
1 answer:
SOVA2 [1]3 years ago
4 0

Answer:

Because flu viruses evolve so quickly, last year's vaccine may not protect you from this year's viruses. New flu vaccines are released every year to keep up with rapidly adapting flu viruses.

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Once the newly made spring has been hardened, what temperature should it be drawn to?
bagirrra123 [75]

Temperature should it be drawn to 600°-650° Fahrenheit for the newly made spring has been hardened

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2 years ago
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