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1
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remains of organisms in tar, amber or ice
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2
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when an organism no longer exists and will never again exist
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3
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animal with strong legs and eggs with thick shells
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4
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animal that evolved from lungfish
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5
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evidence of the activities of ancient organisms
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6
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name of fossil used to help geologists match rock layers
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7
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hardened layer of rock below Earth's surface
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8
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animal that feeds its young milk
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9
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fossils in which minerals replace all or part of an organism
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15
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a hardened layer of lava on Earth's surface
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16
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a copy of the shape of an organism
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17
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animal with a backbone
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19
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'Age of the Mammal'
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20
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preserved remains or traces of living things
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21
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'Age of the Fish'
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22
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'Age of the Reptile'
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