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| a characteristic that improves an individual's ability to survive and reproduce in a particular environment |
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| a group of organisms that are closely related and can mate to produce fertile offspring |
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| the process in which inherited characteristics within a population change over generations such that new species sometimes arise |
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| the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock |
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| a historical sequence of life indicated by fossils found in layers of the earth's crust |
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| a genetically determined characteristic |
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| the human practice of breeding animals or plants that have certain desired traits |
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| the process by which individuals that are better adapted to their environment survive and reproduce more successfully that less well adapted individuals do; a theory to explain the mechanism of evolution |
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| the period between the birth of one generation and the birth of next generation |
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| the formation of new species as a result of evolution |
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