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Science Why did trilobites go extinct and why are index fossil so important

User Jaryl
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Because they evolved rapidly, and moulted like other arthropods, trilobites serve as excellent index fossils, enabling geologists to date the age of the rocks in which they are found.
User Jeremie Ges
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Step-by-step explanation:

Because they evolved rapidly, and moulted like other arthropods,trilobites serve as excellent index fossils, enabling geologists to date the age of the rock in which they are found

User Nathan Reed
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