What were the Dravidians job?

For transactions they used seals as coins, some of which depict a prototype of the god Shiva. Dravidians had an advanced city culture more ancient than the Aryans, who, as Indian legends tell and some dispute, invaded India from central Asia in several waves around 1500 BCE.

Explanation:

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)

what the first or next guys says