1. The growth of sedantary farming greatly accelerated the pace of technological and social change.
2. Still the man used the physical energies of human and animals to use the agricultural and manufacturing tools.
3. He used wheel to make pots, plough to plough his fields and boats to transport his goods and kiln of blacksmith to make his tools.
4. He burnt firewood to cook his food.
5. Thus when they began agriculture man used merely the physical energy of human beings and animals.
