The first metal used by humans appears to have been copper, then bronze came into widespread use, but ____________________ is the key metal of history because it was more common, cheaper, lasted longer, and held an edge better than previous metals.

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The Answer of The first metal used by humans appears to have been copper, then bronze came into widespread use, but ____________________ is the key metal of history because it was more common, cheaper, lasted longer, and held an edge better than previous metals.

The First Metal Used by Humans Appears to Have Been