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11 questions from this quiz
Remains of organisms from millions of years ago
Evidence for evolution by natural selection
Footprints preserved in rock
Hard parts replaced by minerals
When decay cannot occur
They had soft bodies that didn't leave traces
Destroyed many fossil traces over time
No living individuals of a species left
Asteroid collisions and volcanic eruptions
New diseases, predators, or competitors
Bones and teeth are hard and preserve well
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