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.
Answer:
The answer is A. Warmer colors seem to advance and cooler colors appear to recede
Explanation:
Answer:
that is true
Explanation:
because it helps the writer gather more points for his story
D. Having telephones in the lobby in order to call residents
