What new scientific discoveries came about in the 1920’s and 1930’s

Vitamins C and E, penicillin - the first of the modern antibiotics, innovations in immunization, and the discovery of insulin which made the treatment of diabetes possible.

Explanation:

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mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.