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Three of the most important breakthroughs in medicine were the identification of
insulin, the introduction of aspirin, and the discovery of penicillin.

Three of the most important breakthroughs in medicine were the identification of  insulin, the introduction of aspirin, and the discovery of penicillin.

Explanation:

The text is doesn't need any additional punctuation

you have to either add a photo or put them answers in with the questions

that is the way of a cheater and cheaters get nothing but bad grades and in trouble.