The two sentences can be joined to form "People thousands of years ago made tools, weapons, and art, and these objects are called artifacts."
The options for joining words in the question are "and", "or", "but" and "so." Among those options, the best one to join the two sentences is "and", which indicates we are adding some more information about something.
The first idea is that people made objects thousands of years ago. The second idea that we must add is that those objects are now called artifacts. Thus:
- "People thousands of years ago made tools, weapons, and art, and these objects are called artifacts."
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