It was because of the fact that European countries were allied to each other, that drew them into the conflict.
Militarism, or the building up of a nation's military, was done because Europe was nervous. Serbia built up it's military, which made Austria-Hungary nervous, so they built up their military, which made Russia nervous, so...and so on.
He was the one who came up with the notion of dividing government power into three branches: executive, legislative, and judiciary. This viewpoint affected the architects of the Constitution when it came to formulating laws and dividing responsibilities, as well as the insertion of safeguards to protect individual liberty.
The way you worded the question seems a bit confusing but I will try my best.
early homosapiens did adapt to living conditions by creating tools. though they were very simple such as a sharp rock or a stick which could be used for various purposes. in the terms of processing food, they didn't take out an easy bake oven and just cook a wild animal, but they would use tools to ease their simple tasks. so T. though if you mean "prehistoric people" as non homosapiens, maybe Australopithecus which is an older ancestor of the homosapiens then it's hard to say.
