What region was a trading partner for the Harappan civilization and what route did traders likely use to get there?

Most likely, they traded with the Mesopotamia region. The route they most likely used was the Arabian Sea.

Explanation:

well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go

adopted the practice of proskynesis, a persian court custom that involved bowing down and kissing the hand of others, depending on their rank.