Biology
Biology, 02.02.2021 22:30, christheicebear

A type of trilobite is used as an index fossil. These fossils were made about 540 million years ago. A scientist finds a trilobite fossil in layer 3 in the
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A type of trilobite is used as an index fossil. These fossils were made about

540 million years a

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Answers: 2

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A type of trilobite is used as an index fossil. These fossils were made about 540 million years ago...

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