古生物学家在研究化石的过程中�现各类生物的化石在地层里出现有一定的规律在越早形成的地层里成化石的生物种类越越 在越晚�的地层里 Sketch Coloring Page

古生物学家在研究化石的过程中�现各类生物的化石在地层里出现有一定的规律在越早形成的地层里成化石的生物种类越越 在越晚�的地层里 Template

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tomski古生物学家在研究化石的过程中�现各类生物的化石在地层里出现有一定的规律在越早形成的地层里成化石的生物种类越越 在越晚�的地层里 coloring

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