How did the environment of arabia serve as a form of protection during much of the region's history?

The Arabian Peninsula is a one of the harshest places on the planet, and this has served very well for the people living in here as a protection from invaders. This peninsula is almost totally covered by deserts. There are extremely high temperatures, and also strong winds that create deadly sandstorms. There isn't any river that has water throughout the whole year, and also the food resources are very scarce. All of this made it very unattractive for any invaders for starters, and also as a great protective barrier, which led to a partial isolation of the people in this region.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.

the neolithic revolution began the era of permanent societies, the reliance on the limited amount of land gave way to political organization and this political organization caused social organization which was divided by amount of property and power.

the neolithic revolution (new stone age) was the first agricultural revolution. it was a gradual change from nomadic hunting and gathering communities and bands to agriculture and settlement. this period is described as a "revolution" because it changed the way of life of communities which made the change.

sentence:

let´s farm and domesticate these animals so we do not be hunting in the woods all the time