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| a characteristic that helps an organism survive in its environment |
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| the most specific of the seven levels of classification; characterized by a group of organisms that can mate with one another to produce fertile offspring |
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| the process by which populations accumulate inherited changes over time |
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| the solidified remains or imprints of a once-living organism |
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| a historical sequence of life indicated by fossils found in layers of the Earth's crust |
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| the remnant of a once-useful anatomical structure |
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| a distinguishing quality that can be passed from one generation to another |
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Definition
| the breeding of organisms that have a certain desired trait |
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Definition
| the process by which organisms with favorable traits survive and reproduce at a higher rate than organisms without the favorable trait |
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Definition
| a change in the order of the bases in an organism's DNA; deletion , insertion, or substitution |
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| the period between the birth of one generation ant the birth of the next generation |
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Definition
| the process by which two populations of the same species become so different that they can no longer interbreed |
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