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Question
The first signs of bronze, an alloy of [...], date to around 2500 BCE, but the alloy did not become widely used until much later.
Answer
copper and tin

Question
The first signs of bronze, an alloy of [...], date to around 2500 BCE, but the alloy did not become widely used until much later.
Answer
?

Question
The first signs of bronze, an alloy of [...], date to around 2500 BCE, but the alloy did not become widely used until much later.
Answer
copper and tin
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The first signs of bronze, an alloy of copper and tin, date to around 2500 BCE, but the alloy did not become widely used until much later.

Original toplevel document

Human history - Wikipedia
s and ornaments around 6000 BCE. Gold soon followed, primarily for use in ornaments. The need for metal ores stimulated trade, as many areas of early human settlement lacked the necessary ores. <span>The first signs of bronze, an alloy of copper and tin, date to around 2500 BCE, but the alloy did not become widely used until much later.[37] Agriculture created food surpluses that could support people not directly engaged in food production,[38] permitting far denser populations and the creation of the first cities and

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