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        | the remains or physical evidence of an organism preserved by geological process |  | 
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        | a characteristic that improves an individuals ability to survive and reproduce in a particular environment. |  | 
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 | Definition 
 
        | a group of organisms that are closely related and can mate to produce offspring. |  | 
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 | Definition 
 
        | the process in which inherited characteristics within a population change over generations such that new species sometimes arise. |  | 
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 | Definition 
 
        | a historical sequence of life indicated by fossils found in layers of the earths crust. |  | 
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 | Definition 
 
        | a genetically determined characteristic. |  | 
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 | Definition 
 
        | the human practice of breeding animals or plants that have a certain desire characteristics. |  | 
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 | Definition 
 
        | the process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals. |  | 
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 | Definition 
 
        | the period between the birth of one generation and the birth of the next generation. |  | 
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        | Term 
 | Definition 
 
        | the formation of new species as a result of evolution. |  | 
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