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The fossil record
Explore how fossils, preserved remains or traces of past life, form in sedimentary rock layers over millions of years. Understand how scientists use rock layers and radiometric dating to determine fossil ages. Describe how the fossil record reveals Earth’s history, showing changes in complexity, diversity, species origins, extinctions, and patterns of mass extinction.
This lesson is part of the members-only content of Middle school biology . The first 3 lessons of every course are free — this one starts after the free preview.
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