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balu736 [363]
3 years ago
14

Item 12

History
2 answers:
zalisa [80]3 years ago
4 0

Answer:

American physician and medical researcher who developed the first safe and effective vaccine for polio.

Explanation:

miss Akunina [59]3 years ago
3 0

Answer:

Creating a polio vaccine.

Explanation:

Jonas Salk was a doctor that made the first ever polio vaccine.

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