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9 cards from this deck
Preserved remains or traces of organisms from millions of years ago
Embedded in rock layers
Lack of oxygen/moisture prevents microbial decomposition
Organic parts (teeth, shells, bones) replaced by minerals
Footprints, burrows, rootlets
Evolution - show how anatomy changed over time
Compare species to construct evolutionary trees
Most were soft-bodied and decayed completely
Destroyed early traces via erosion, volcanic activity, tectonics
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