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Answer:
See below.
Explanation:
1. Printing press allowed for the rapid spread of knowledge and facilitate scientific revolution. The specific beginning point is usually thought to be the publishing of Nicolaus Copernicus' De revolutionibus orbium coelestium.
2. Penicillin was used to create other antibiotics either directly or indirectly.
3. How many studies have shown the same results?
Was the livestock given antibiotics?