For many years people depended on nature for their survive. Men hunted animals and women gathered wild plants. When there were no more animals to hunt or plants to gather, the nomads moved to a new place.
Around 8,000 years ago a new way of providing food emerged. Instead of hunting and gathering foods from the environments where they lived, humans learned to simply grow food. Goats were utilized for their meat and milk, cattle, pigs and chickens provided a steady source of food for support of a group of humans.
As a result, many more humans survive the difficulties of life. The population quickly rose from around 2 million humans on the Earth to more than 9 million. Farming allowed people to build permanent villages along rivers, or wherever the ground was fertile enough for crops to grow.