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History, 23.04.2020 18:57 jozlynn

The work of Jonas Salk contributed to the trend shown on this graph
Select one:

developing the x-ray machine.

finding safer ways to perform amputations.

introducing a new vaccine.

perfecting the refrigeration of medicines.


The work of Jonas Salk contributed to the trend shown on this graph Select one: developing the x-ray

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Select one:

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