Fossils
The remains or traces of living things from long ago, preserved in rock. In rock layers that haven't been disturbed, deeper fossils are older, so fossils record how life has changed over billions of years.
Depth 1 · Foundation
You can explain how a fossil forms, why deeper layers usually hold older fossils, and what a fossil like Tiktaalik shows about how life changed.
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- 1
Foundation
You can explain how a fossil forms, why deeper layers usually hold older fossils, and what a fossil like Tiktaalik shows about how life changed.
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