What was one of the challenges doctor Salk faced in his attempt to create a polio vaccine ?

1 answer:

Oliga [24]3 years ago

4 0

To do surgery well I think

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oksian1 [2.3K]

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flood or tsunamy ) i know only this

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gogolik [260]

<span>the segregation of males and females </span>

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garik1379 [7]

The answer to the first question is false and the answer to the second is false as well

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frozen [14]

Answer: E

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AveGali [126]

In my opinion, he could sound like he is quite reckless and looking for trouble.

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