Domestication.
1) the first three only apply to plants
2) domestication is the cultivation of a plant for food or the process of taming an animal.
The correct answer to this open question is the following.
Current scientific evidence suggests that people arrived in America when the Berin Strait was frozen, approximately 25,000 to 30, 000 years ago.
The Berin Strait is located in the Northern part of the North American continent and the Asian continent. Historians and anthropologists agree on the idea that in that time, the sea was frozen by the extremely cold temperatures and that is when people from Asia that were following animal herds to hunt and feed their families, crossed the Berin Strait from Russia to Alaska. Other scientists name this place as Beringia.
<span>Answer: the line dividing democratic and communist countries in Europe. The term was used to name the ideological, political and sometimes physical borders between Western (Democratic) nations in Europe and Eastern (communist) nations in Europe, after the II World War. </span>
The correct answer is the second one. Mechanization reduced the need for farmers. With machines they didn't need to do as much work. This way farm life was easier.
