Final answer:
Trilobites became extinct during the mass extinction event at the end of the Permian period.
Explanation:
Trilobites became extinct at the end of the Permian period, approximately 250 million years ago, during a mass extinction event. This extinction event, known as the end-Permian extinction, led to a significant loss of marine and terrestrial species, with trilobites being among the casualties due to factors like volcanic activity and global warming.
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