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12 questions from this quiz
Millions of years ago
Embedded in rock layers
Absence of oxygen or moisture
Soft tissues or organic material
Organic parts replaced by minerals
Teeth, shells, and bones
Footprints, burrows, or rootlets
Ground hardens forming a cast
They show anatomy changed over time
How closely related they are
They were soft-bodied and decayed
Erosion, volcanic activity, tectonics
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