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12 cards from this deck
Preserved remains of organisms in rocks from millions of years ago
Evolution by natural selection
Footprints & burrows preserved in rock
Replaced by minerals (mineralisation)
Don't decay when oxygen/water are absent or temperature is low
Oxygen and water
Soft bodies, geological activity, decay, eaten
No living individuals of a species left on Earth
Organisms can't adapt quickly enough to major changes
Asteroid collisions, massive volcanic eruptions
New diseases, predators, or competitors
Bones & teeth are hard, more likely preserved
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