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| a single bed of sedimentary rock |
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| any primate of the family Hominidae, which includes modern man (Homo sapiens) |
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| one who studies the science of the forms of life existing in former geologic periods, as represented by fossils |
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| one who studies the origins and predecessors of the present human species, using fossils and other remains |
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| the science that deals with the history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is undergoing |
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| a small valley or ravine originally worn away by running water |
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| relating directly and significantly to the matter at hand |
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| possessing or exhibiting energy, especially in abundance |
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| the usual major subdivision of a family or subfamily in the classification of organisms |
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| the basic category of biological classification, composed of related individuals that resemble one another |
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| a person from whom one is descended |
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| a member of an extinct subspecies of humans |
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| the accumulation or laying down of matter by a natural process |
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| to overwhelm with amazement |
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| an animal having two feet |
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| the condition of being arranged in social strata or classes within a group |
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| humankind of the modern age, species of bipedal primates to which modern humans belong |
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