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

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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.
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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

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User Nathan Reed
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