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harry140:
why do animals form swarms??
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start what's your questions...
why do animals form swarms
sry i don't know
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why do you need to get flu shot every year?
in which class this question related to.
answer the question bro
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What is ur question????...
why do you need to get a flu shot every year?
Because flu viruses evolve so quickly, last year's vaccine may not protect youfrom this year's viruses. Aftervaccination, your immune system produces antibodies that will protectyou from the vaccine viruses. In general, though, antibody levels start to decline over time — another reason to get a flu shot every year.
good
hmm :)
why is it so hard to cure the cancer??
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