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When trilobites ruled the world
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When did trilobites become extinct? (are they alive today?)
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Why did trilobites go extinct?
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When Trilobites Ruled the World - The New York Times
Why did trilobites go extinct? | Live Science
Trilobites... So Many Trilobites… - Darwin's Door
When Did Trilobites Become Extinct? (Are They Alive Today?) - Rock Seeker
