What was the impact of the discovery of fire, wheel and iron on human civilisations?


The life of human beings completely changed with the discoveries of fire, wheel and iron. These discoveries proved to a milestone in the development of civilisations. The tools became more sophisticated and farmers started cultivating crops near the river banks. With the passage of time, human beings learnt new ways of farming. Now, they started living a settled life as crops required constant care throughout the cropping period. They were not required to wander in search of food and could afford to settle down at one place. Hence, building of permanent shelters, domestication of animals and use of clothes made of fibre became a part of human life.