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Geraud Chapter 6

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Term
Definition
species   group of organisms that share similar characteristics and can reproduce among themselves  
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evolution   change in inherited characteristics over time  
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natural selection   a process by which organisms with traits best suited to their environment are more likely to survive and reproduce  
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variation   inherited trait that makes an individual different from other members of the same species  
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adaptation   any variation that makes an organism better suited to its environment  
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gradualism   model describing evolution as a slow process by which one species changes into a new species through a series of mutations  
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punctuated equilibrium   model describing the rapid evolution that occurs when mutation of a few genes results in a species suddenly changing into a new species  
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camouflage   adaptation in which coloring of organism blends into its environment  
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survival of the fittest   organisms with the best traits survive and reproduce  
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Lamark's theory of evolution   traits acquired during a parent's lifetime are passed on to offspring  
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Darwin's theory of evolution   mutations occur with offspring and if they are advantageous the organism survives and reproduces, over time a new species can evolve  
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sedimentary rock   a type of rock in which fossils are found, forms from mud, sand and silt  
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radiometric dating   calculating the age of a rock layer using radioactive elements  
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embryology   study of embryos and their development  
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homologous   body parts that are similar in structure and origin and can be similar in function  
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vestigial structures   structure that doesn't seem to have a function and may once have functioned in the ancestor  
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relative dating   older rocks lie below younger rocks  
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fossils   remains of an organism, could be bone, footprints, or cast of body  
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primate   group of mammals including humans, monkeys, and apes that share characteristics such as opposable thumbs and flexible shoulders  
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hominid   humanlike primate that appeared about 4 million to 6 million years ago  
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Homo sapiens   early humans that likely evolved from Cro-Magnons  
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wise human   meaning of Homo sapien  
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DNA   deoxyribonucleic acid, molecule that contains instructions for making an organism  
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opposable thumb   thumb can touch fingers on same hand, adaptation for grasping and climbing  
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"Lucy"   name given to female Australopithecus skeleton found in Africa  
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Cro-Magnon   hominid that was very human like, most likely ancestor to Homo sapien  
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Created by: geraud.aaron
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