<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.
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NOT THE CORRECT ANSWER IS (A) so my next best guess is (C)
What we know for sure is that the Native American population drastically dropped as a result of illnesses that the Europeans brought with them.
Also, we know that a great number of Africans were brought to America as slaves (today's African Americans are their descedants)- these two facts already led us
