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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 population 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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Definition
| 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 bases in an organism's DNA; deletion, insertion, or substitution |
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| The period between the birth of one generation and 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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