One can be gunpowder that was borrowed from China, which includes things like fireworks. Another can be numbers that were borrowed from Arabic and Hindu cultures, the basic system of 0-9. There were many more but these are quite common and have been around for a long time.
<u>Type of plumbing that Harappans had:</u>
The plumbing in the Harappans civilization was one of the most advanced plumbing of that time and in their plumbing system they had created proper sewage systems, sanitation systems, and there was a proper method of disposing the waste of the civilization.
Along with the plumbing, there was proper civic planning in that civilization. This plumbing system of Harappans civilization was really important because it was the first civilization that had such modern plumbing and civic planning and was modern in this way.
I don’t understand your question
