Answer:
Mountains were Steep and little level for farming.
Explanation:
Offering standardized products at a lower price thanks to the economies of scale.
Since nobody learned what you learned you're going to have to do this one on your own sorry :/
i think you mean antibiotic ... but Alexander Fleming was the one who advanced the antibiotic (world) and was responsible for creating these categories of medicine... this affected the 20th century because millions of people use antibiotics everyday and without them... many diseases would still affect people without a cure
Answer: I am pretty sure it was the Eastern front. I hope this helps.
