The Mound Builders used metal tools, and were probably metal builders. Based on that information I would say the answer is B.Copper, because copper is a metal.
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c is the answer is types of elements of art
Hi also try making friends with people around you , you can always make friends online but be careful
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thank youuuu merry christmas♡♡♡♡♡♡♡
You need like sun and lots of lights
