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Readme [11.4K]
3 years ago
14

GIVING BRAINLIEST Why is it difficult to create a vaccine for the flu?

Biology
2 answers:
VladimirAG [237]3 years ago
7 0

Answer:

B. Antigen Shifting

Explanation:

Hope this helps:)

sp2606 [1]3 years ago
7 0
The answer is antigen shifting.
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