Answer:
Jews, Christians, and Zoroastrians lived among the established Arab population.
Explanation:
There were Christianized tribes, as well as Christian communities. The Sasanian empire, which had influence in northern Arabia was mostly adept of Zoroastrianism. On the other hand, Judaism had a strong influence on the birth of Islam, due to its strong presence in this territory, in Medina, a very important city for Islam, they were half of the population at the time of arrival of Mohammed.
True, after WW2 the Germans lost 20ish percent of land.
One very famous, perhaps the most famous way was through improvised vaccination. Specifically, George Washington ordered his healthy men to be injected with substance taken from the wounds of the sick men during a smallpox infection.
A risk was that those men would get sick just like the the sick men did, but the the potential reward would be that they would get sick in a controlled way and that they would be able to fight this disease.
Answer: Egypt took development around the Nile River. Mesopotamia developed between the Tigris and Euphrates rivers. Both Egypt and Mesopotamia had governments. Those governments ran with one main ruler. Egypt had a centralized government with a Pharaoh, instead of a king like Mesopotamia. Both civilizations emerged around 3500 and 3000 BCE. Both civilizations shared differences and similarities between religion, culture etc.
Explanation:
You may keep researching or build and elaborate on what I have given you, cheers!