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The Evolution of Living Things

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Term
Definition
Adaptation   A characteristic that helps an organism survive and reproduce in its environment  
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Species   A group of organisms that can mate with one another to produce fertile offsprings  
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Evolution   The process by which population change over time  
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Fossil   The solidified remains or imprints of once living organisms  
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Fossil record   Historical sequence of life  
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Vestigial structure   Remnants of once useful structures  
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Trait   Distinguishing qualities that can be passed from one generation to another  
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Selective breeding   Breeding of organisms that have a certain desired trait  
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Natural selection   The process of which organisms with favorable traits survive and reproduce at a higher rate than organisms without favorable traits  
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Mutation   A change in the order of the bases in an organisms DNA; deletion, insertion, or substitution  
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Generation time   The period between the birth of one generation and the birth of the next generation  
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Speciation   The process by which 2 populations of the same species become so different that they can no longer interbreed  
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