Explanation:

The Indus Valley civilization, a predominantly secular civilization, and the religious element, though present, did not dominate the scene. It was clearly also the precursor of later cultural periods in India. Unlike the contemporary civilizations like messopotamian and Egyptian where the Priest Kings rules, Indus valley was largely secular
These people of the Indus Valley had many contacts with the Sumerian civilization of that period, and there is even some evi-dence of an Indian colony, probably of merchants, at Akkad. 'Manufactures from the Indus cities reached even the markets on the Tigris and Euphrates. Conversely, a few Sumerian devices in art, Mesopotamia toilet sets, and a cylinder seal were copied on the Indus. Trade was not confined to raw materials and luxury articles; fish, regularly imported from the Arabian Sea coasts, augmented the food supplies of Mohenjo-daro.'
Cotton was used for textiles even at that remote period in India.