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the cave was used by cavemen
it dates back thousands of years ago.
date it was used - 900,000 years ago -
the bark house would date back 70,000
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the hut is a mini house sometimes with a door. the hut dates back about 500,000 years ago
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the log house dates back about 200,000 years ago
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the castle dates back about 100,000 years ago
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the modern house is a house we use today.